second, the opportunity to cast spells for free for the rest of the game without depleting resources in hand
The best case for all of these cards is probably Edric, Spymaster of Trest, which held steady at around $4 with very fringe legacy play, until it ended up winning a SCG open last April and spiked to $15 overnight (before getting reprinted in Conspiracy a few months later and dropping dramatically)
Admittedly the card needs a turn to naturally start pumping out tokens, but once it does, Brudiclads token warping ability can grant us an enormous amount of profit
Namor the Sub-Mariner Namor the Sub-Mariner takes the same pestersome play pattern people associate with Talrand, Sky Summoner and ramps it up
What do you remove
Sire of Seven Deaths is a giant Eldrazi that helps you to stabilize your board, and it fits into every deck interested in playing a 7-drop, especially in colors that want to gain life and cant (, mostly)