Forest

Gigantosaurus

Deadly Recluse

Reach (This creature can block creatures with flying.)
Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Ram Through

Target creature you control deals damage equal to its power to target creature you don't control. If the creature you control has trample, excess damage is dealt to that creature's controller instead.

Llanowar Elves

Pelt Collector

Whenever another creature you control enters or dies, if that creature's power is greater than this creature's, put a +1/+1 counter on this creature.
As long as this creature has three or more +1/+1 counters on it, it has trample.

Garruk, Primal Hunter

+1: Create a 3/3 green Beast creature token.
−3: Draw cards equal to the greatest power among creatures you control.
−6: Create a 6/6 green Wurm creature token for each land you control.

Ghalta, Primal Hunger

This spell costs {X} less to cast, where X is the total power of creatures you control.
Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

Steel Leaf Champion

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

Giant Growth

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

Barkhide Troll

This creature enters with a +1/+1 counter on it.
{1}, Remove a +1/+1 counter from this creature: This creature gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)