Iikiyal, Vengeful Paladin

Double strike, haste, menace, vigilance
Iikiyal, Vengeful Paladin can block an additional creature each combat.
If Iikiyal, Vengeful Paladin hasn't been exerted
this turn, you may exert it as it attacks. When you
do, after this phase, there is an additional combat
phase. Tap Iikiyal, Vengeful Paladin at the end of
the turn. (An exerted creature won't untap during
your next untap step.)