Ivan, Bane of Mice

{p/u} {t} Add a +2/+2 counter to Ivan, Bane of Mice.
{p/r} {t} Ivan, Bane of Mice gains Haste and First Strike until end of turn.
{t} Sacrifice {x} creatures. Add {x} mana of any color to your mana pool.
"Meeeooowww...!"