Mercy Killing

2, T: Tap target creature.

T: Add C. G/W, T: Add GG, GW, or WW.

(T: Add W.)

Whenever a player casts a white spell, you may pay 1. If you do, you gain 1 life.

Enchant creature Enchanted creature gets +1/+1 for each Plains you control and has flying.

First strike This creature gets +1/+1 as long as you control another white creature.

T: Prevent the next 1 damage that would be dealt to any target this turn. Put a -1/-1 counter on this creature: Untap this creature.

If you would gain life, you gain twice that much life instead.