Syr Lowell, Errant Warden

Double strike, reach
Whenever a land enters the battlefield under
your control, create a 2/2 green Wolf creature
token.
Whenever Syr Lowell, Errant Warden attacks,
exile the top four cards of your library. Creatures
you control get +X/+X until end of turn, where
X is the highest mana cost among cards exiled
this way.