Hakari, High Fevered Gambler

Trample
Private Prue Love Train - Hakari gets +1/+0 for
each time he attacked this turn.
Idle Death Gamble - At the beginning of combat
on your turn, roll two six sided die. If the result
is 12 or higher, there is an additional combat
phase after this phase. At the beginning of that combat,
untap Hakari and he gains indestructible until
end of turn.