Codex of Frailty (Yellow)

Each hero puts an attack action card from their graveyard face-down into their arsenal. Each hero that does, discards a card.

Create a Ponder token under your control and a Frailty token under each opponent's control.

Go again

Rulings

From the Outsiders release notes

A player can’t put an attack action card from their graveyard into their arsenal if they don’t have any attack action cards in their graveyard, or they don’t have any empty arsenal zones.
This effect is not optional. If a player has at least one attack action card in their graveyard and an empty arsenal zone, they must put one of those cards in their arsenal.
You can play this card and have no cards in hand. If you are instructed to discard and you have no cards in hand, you simply don’t discard.
Players choose and put the card in their arsenal starting with the turn player and going in player turn order (clockwise) around the table. Then the players that have successfully done so, choose and discard a card starting with the turn player and in the same player order.
Each player is required to show what card they are putting into their arsenal.
Creating Ponder and Frailty tokens is not dependent on the preceding effects.

Keyword notes

Go again - Go again allows multiple actions to be played in a turn when usually playing an action with use up your action point, and therefore end your turn. A card with go again gives the controller of that card or activated ability 1 action point when it resolves.

When an action with go again resolves, its controller gains 1 action point.
Multiple instances of go again on the same card or activated ability do not stack. If a card or activated ability has multiple instances of go again when it resolves its controller gains 1 action point only.
If an action with go again does not resolve, its controller does not gain 1 action point.
You cannot reveal a card with no to Belittle. The card must have a value to its power that is 3 or less. (0 is a value)