B. Ironvein, Simic Savior

Whenever you attack with 5 or more Beasts, creatures you control get +2/+2, Vigilance and Trample until end of Turn.
{b/r}{b/r}{b/r}, Sacrifice a Beast: Return Target Beast from your Graveyard to the Battlefield, it has Haste.
{g/u}{g/u}{g/u}{g/u}{g/u}: Creatures you control, in your library, and in your graveyard are Beasts in addition to their other types.
Whenever you attack with 10 or more Beasts, Transform Bandar Ironvein.