Endless Hatred

Endless {g}{g} (If you pay the Endless cost, you may cast this spell again for free, but all targets must be the same ones the first cast targeted. You may pay the Endless cost as many times as you like. If one or more targets leave play, paying the Endless cost again returns this card to your hand)
Target green creature you control deals damage equal to its strength to target creature your opponent controls.
Eternal hatred ensures revenge, one day or another.