Topsy Turvy

Instant - Destroy this: Until end of turn, if one or more cards would be put on top of a deck, instead they're put on the bottom.

Arcane Barrier 1

Rulings

From the Compendium of Rathe release notes

When Topsy Turvy’s instant activated ability resolves, it generates a replacement effect for the remainder of the turn. If a single event would cause one or more cards to be put on top of a deck (e.g. Opt, effects that search and put cards on top of the deck.), those cards are put on the bottom of the deck instead. For example, if you were instructed to Opt 2, you would look at the top 2 cards of your deck, and normally you can choose any combination of cards to go on the top or bottom. If Topsy Turvy’s effect was active, you would put both cards on the bottom of the deck instead in the order of your choosing.
Effects that simply let you look at the top of your deck (e.g. Dash I/O) will not be replaced by Topsy Turvy’s effect. Looking is different from putting a card on top of a deck: the two effects are distinct from each other.
If an effect instructs you to look at the top card of your deck and then gives you an option to put it on the bottom (e.g. Cut to the Chase, Right Behind You, Hornet’s Sting), the card will remain on the top of the deck if you choose to not put it on the bottom. Looking is different from putting a card on top of a deck: the two effects are distinct from each other.
If an effect tells you to look at the top card of your deck, then has subsequent conditional effects that can result in the card being placed either on the top or bottom of the deck (e.g. Pack Call, Firewall), that card will be put on the bottom of your deck under Topsy Turvy’s replacement effect. Looking is different from putting a card on top of a deck: the two effects are distinct from each other. If you were to normally meet the condition to put the card on top of your deck after looking at it, you would put it on the bottom instead.
If you were instructed to Opt 1 while under the effect of Topsy Turvy, you will look at the card; however, the card you look at will be put on the bottom of your deck as you will not be able to put it on the top as part of the Opt effect.
If an effect instructs you to put a card X cards from the top of your deck (e.g. Evo Steel Soul Controller, Submerge), Topsy Turvy’s effect will not modify it. The card will still go in the prescribed position.
If an additional cost requires you to put a card on the top of your deck (e.g. Seek Horizon), you will put the card on the bottom of your deck instead to fulfill that cost. Doing so will meet the condition of paying the additional cost for the purposes of cards and effects.
If an alternative cost allows you to put a card on the top of your deck instead of paying that card’s cost (e.g. Moon Wish, Sun Kiss), you can still use that card’s alternative cost; however, you will instead put it on the bottom of your deck to fulfill that cost. Doing so will meet the condition of paying the additional cost for the purposes of cards and effects.

Keyword notes

Arcane Barrier - is one of the most common ways to prevent arcane damage. If you would be dealt arcane damage you may pay X{r} instead to prevent X arcane damage that source will deal.

You can have multiple instances of arcane barrier.
You can only prevent one arcane damage per arcane barrier per source.
You can prevent arcane damage you do to yourself.
Players cannot respond to the prevention.
To fully prevent a card dealing 3 arcane damage, you would require 3 arcane barrier and 3 resources to prevent it. To fully prevent 3 Runechant tokens (3 instances of 1 damage). You would require 1 arcane barrier and 3 resources to prevent it.
Preventing arcane damage does not destroy the equipment with arcane barrier (unless otherwise specified).
Arcane barrier is a replacement effect. It does not use the chain. Players cannot respond to the prevention.
Each source of arcane barrier can replace damage 1 time per source. To fully prevent a card dealing 3 arcane damage, you would require arcane barrier 3 and 3 resources to prevent it. To fully prevent 3 Runechant tokens (3 instances of 1 damage). You would require arcane barrier 1 and 3 resources to prevent it.
If a card has Arcane Barrier 2, you must pay the full two resources even if it only prevents one damage. You cannot choose to pay one resource to prevent one damage.
You can have multiple instances of arcane barrier, for example Nullrune Hood, Nullrune Cloak, and Nullrune Gloves.
Arcane barrier can be used every time you would be dealt arcane damage. It’s not limited to once per turn.
Each instance of arcane barrier you control can be used 1 time only, each time a source would deal arcane damage to you. For example if a source would deal 5 arcane damage to you, and you control two cards with arcane barrier 1, you will in total be able to prevent 2 arcane damage this source would deal to you.
To fully prevent a card dealing 3 arcane damage, you would require 3 arcane barrier and 3 resources to prevent it. To fully prevent the arcane damage from 3 Runechant tokens (3 instances of 1 damage), you would require 1 arcane barrier and 3 resources to prevent it.
A equipment with arcane barrier does not move to the chain when arcane barrier is used.
You can prevent arcane damage you would deal to yourself.
Players cannot respond to the prevention. Arcane barrier is a replacement effect, not an activated or triggered ability.
To fully prevent a card dealing 3 arcane damage, you would require 3 arcane barrier and 3 resources to prevent it. To fully prevent 3 runechant tokens (3 instances of 1 damage from difference sources). You would require 1 arcane barrier and 3 resources to prevent it.