Grey-Seer Thanquol

Ward{2}
If a creature an opponent controls would die, exile it instead.

At the beginning of each end step, create X 1/1 black Rat creature tokens with “This creature gets +1/+1 for each other Rat you control,” where X is the number of creatures that were exiled under your opponents’ control this turn.
Proxy of Vren, the Relentless