Combos Utilizing Aggression

enchant ancient silverback with agression, and it'll have trample and first strike. since ancient silverback is easily regenerated, simply keep 1 forest mana open if you decide not to attack with it.

Enchant Rishadan Airship to give it first strike as either an attacker or a blocker

the juggernaut must attack each turn anyway.

summon a ghoul w/ the ashen ghoul. then make the ghoul sacred w/ the agression. the ghoul then does double damage and has double health

They can not attack so they destroy the creatures that did not attack

When Academy researchers is cast Aggression comes into play at no cost. Academy Researchers gains first strike and trample.