Frillscare Mentor

When this creature enters, put a menace counter on target non-Human creature you control. (It can't be blocked except by two or more creatures.)
{2}{R}, {T}: Put a +1/+1 counter on each creature you control with menace.

Sonorous Howlbonder

Menace
Each creature you control with menace can't be blocked except by three or more creatures.

Iron Bully

Menace (This creature can't be blocked except by two or more creatures.)
When this creature enters, put a +1/+1 counter on target creature.

Mr. Orfeo, the Boulder

Whenever you attack, double target creature's power until end of turn.