Siraya, Pyrestorm Seer

Double strike, haste

At the beginning of combat on your turn, a target creature you control gets +2/+2 until end of turn, and a target creature an opponent controls gets -2/-2 until end of turn.

Whenever a creature you control dies, you may pay {r/g}{r/g}{1}. If you do, destroy a target land.

“Wars are won by those who see the flames before they ignite.”