Elaine, the Flame Evangelist

Lifelink, Flying
Whenever Elaine deals 1 or more damage to another creature, all spells cost {1} less to cast until
end of turn.
Whenever an opponent casts a spell for less than its mana value, put a +1/+1 counter on Elaine.
{2}, Remove a +1/+1 counter from Elaine: Elaine deals 2 damage to target creature you control. Any player may activate this ability.