Grumlak, Junior Numismancer

Whenever a player loses a coin flip, if Grumlak is
on the battlefield, it phases out and you create a
Gold token. (Sac: Add one mana of any color.)
Sacrifice a token: Until end of turn, Grumlak
gains skulk and has "Ward —Flip a coin."
{2}: Flip a coin. Then Grumlak gets +X/+0 until
end of turn, where X is the number of coin flips
you've won this turn. Activate this ability only
during combat.