Angron

Haste, first strike, flash
This creature must attack each turn if able unless
you pay {b}{r} and you tap it
Butcher's Nails: whenever you attack with this creature, all creatures you control get +4/-2,
menace, double strike and trample until end of turn
{3}{b}{r}: attacking creatures you control get +6/+2, menace, double strike, protection from instants
and trample until end of turn. They do not untap
during your next untap step unless you pay {b}{b}{r}{r}