Every turn that goes by greatly decreases an aggressive decks chances at winning
Value Cards: Goblin Welder Junk Diver Wurmcoil Engine Scrap Mastery Volcanic Offering Blasphemous Act Ruby Medallion Caged Sun Arcane Lighthouse Flamekin Village Great Furnace Reliquary Tower Five of these show out best in an artifact deck or a mono-color theme deck, but the other seven are solid choices
Since this is Bant colored, it's in mana ramp color of Green for the Call half to be reliably cast
Ajani Steadfast can give a creature +1/+1, first strike, vigilance, and lifelink at a +1 loyalty activation
He arrives with plenty of loyalty counters, he can lock down your opponent for a few turns, and if left to scry and draw cards, you'll wind up with an emblem that will almost certainly win you the game
All in Good Time is a free extra turn for the Archenemy