Overwhelming Stampede is an inefficient Overrun that doesnt synergize in a deck that might just have a table of 2/2s
Generous Visitor, Siege Veteran and Wandering Emperor give it great enablers in all current, white archetypes
Overlord Cycle The Overlord cycle are creatures that normally cost a lot of mana, but can be cast for a discount with their impending ability (but enter as an enchantment as opposed to an enchantment creature)
Avacyn is a mainstay of Kaalia of the Vast Commander decks, and a great late-game play for any creature-based strategy
A poor (dare I say obstinate) familiar can impede spellcasting and limit new discoveries, while an excellent familiar like Kediss can enable spellcasting of incredible scale
Pack in a little mana ramp and a few mid-range creatures to keep you going early, then supersize Polukranos and Shipbreaker Kraken