Boggart Brute

Menace (This creature can't be blocked except by two or more creatures.)

Catalyst Elemental

Sacrifice Catalyst Elemental: Add {R}{R}.

Menace (This creature can't be blocked except by two or more creatures.)
When Bone Pit Brute enters, target creature gets +4/+0 until end of turn.

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn. (It can attack and {T} this turn.)

Attacking creatures get +2/+0 until end of turn.

{T}: Target creature gains haste until end of turn. (It can attack and {T} this turn.)