Ridiculously, this is the top of the list because it has more of a chance of seeing Modern play than most of the Assassin's Creed cards
It gave us Stock Up, Ketramose, the New Dawn, and Monument to Endurance, for starters
While Duel Commander and Canadian Highlander are somewhat niche, Sazh has great potential to essentially be a second Nadu in the 99
This in turn makes whatever things you might have going on with your graveyard that much more likely to do their thing and get the required value
19: Snap When used proactively, like removing a creature thats preventing your combo before attempting to win, Snap is essentially free, which is a great start
Etali, Primal Conqueror / Etali, Primal Sickness Speaking of casting free spells, does anybody else think Etali, Primal Conqueror might have been pushed a little too hard