Warden of the Deep Dark

Menace, Trample
Upheaval —{3}{u/b}{u/b}: You may cast Warden any
time you could cast an instant during combat on
your turn, then return it to your hand at the end
of combat.
Warden of the Deep Dark gets +1/+1 for each
Deep Dark land you control.
Take one wrong step and you're dead.