Invoke Nekria (Red)

Transform target ash you control into Nekria. Go again

The dragon of decay, said to roam the crypts of the Demonastery.

Rulings

From the Uprising release notes

Nekria is considered to have dealt damage when a damage event created by Nekria (such as an attack) causes a loss of life on a living object (e.g. a hero or ally). Nekria does not deal damage if its attack is fully defended.
Nekria is considered to have been dealt damage if a damage event causes Nekria to lose life. This can be done with any type of damage (e.g. physical, arcane, untyped).
Adding a -1 counter to Nekria, reduces its life total. If you deal 6 damage to full life Nekria, then add a -1 counter to it, it dies.
-1 counters are not removed at the end of the turn when Allies life totals are reset. If Nekria has two -1 counters on it, its life total will be 5 when it resets at the end of the turn (7 base life – 2 from counters).
Nekria’s triggered effect still triggers (and creates an Ash) even if the damage dealt kills it.

Keyword notes

Transform - Put the X under this/it/him/her

Create a Y and put the X under it.

Transform is a discrete effect.
To transform subject objects into a specified object, first create the specified object in the arena if it does not yet exist, then put the subjects under it.
To transform objects into a token that does not exist yet, first create the token, then put the objects underneath it.
To transform objects into an existing permanent, just put the objects underneath it.
When used in conjunction with cards that flip (e.g. Invocations), the card is first flipped and becomes a permanent in the arena, then the transform will refer to that permanent as the specified object to transform into (the permanent to put cards under).
The transform fails if there are no transform subjects, or if they can not be put under the specified object for whatever reason.

All keywords

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)