Colossal Dreadmaw

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

New Horizons

Enchant land
When New Horizons enters, put a +1/+1 counter on target creature you control.
Enchanted land has "{T}: Add two mana of any one color."

Dinosaur spells you cast cost {1} less to cast.

Enchant creature
When Pious Interdiction enters, you gain 2 life.
Enchanted creature can't attack or block.

Enrage — Whenever Overgrown Armasaur is dealt damage, create a 1/1 green Saproling creature token.

Target creature gets +1/+3 and gains flying until end of turn. Untap it.

Pterodon Knight has flying as long as you control a Dinosaur.

Whenever Territorial Hammerskull attacks, tap target creature an opponent controls.

Slash of Talons deals 2 damage to target attacking or blocking creature.

Whenever Tilonalli's Knight attacks, if you control a Dinosaur, Tilonalli's Knight gets +1/+1 until end of turn.