Krev, Sixth Bloodlord

Krev, Sixth Bloodlord enters the battlefield with X +X/+X counters and Y -Y/-Y counters, where X is the amount of Swamps on the battlefield and Y is the amount of Plains on the battlefield.
When Krev, Sixth Bloodlord dies, you may transfer all +X/+X counters to target creature and all -Y/-Y counters to target creature.
Blood. More blood. MORE BLOOD!