Steel Leaf Champion

This creature can't be blocked by creatures with power 2 or less.

Overprotect

Target creature you control gets +3/+3 and gains trample, hexproof, and indestructible until end of turn.

Rogue's Passage

{T}: Add {C}.
{4}, {T}: Target creature can't be blocked this turn.

Forest

Might of Old Krosa

Target creature gets +2/+2 until end of turn. If you cast this spell during your main phase, that creature gets +4/+4 until end of turn instead.

Avoid Fate

Counter target instant or Aura spell that targets a permanent you control.

Elvish Mystic

Groundbreaker

Trample, haste
At the beginning of the end step, sacrifice this creature.

Giant Growth

Target creature gets +3/+3 until end of turn.

Nessian Boar

All creatures able to block this creature do so.
Whenever this creature becomes blocked by a creature, that creature's controller draws a card.

Might of Oaks

Target creature gets +7/+7 until end of turn.

Gigantosaurus

Thorn Elemental

You may have this creature assign its combat damage as though it weren't blocked.

Frenzied Baloth

This spell can't be countered.
Trample, haste
Creature spells you control can't be countered.
Combat damage can't be prevented.

Bellowing Tanglewurm

Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)
Other green creatures you control have intimidate.