The card must be able to be built-around in multiple ways in the format (sorry The Rack, Scapeshift, and Ad Nauseam, you don't count.) At least one deck that uses the card must be Modern viable at the time of this publication Now with only ten spots to use, I know I'll inevitably leave out some favourites, so please don't be shy in the comments with some honorable mentions
Lifelink What it is When a creature with Lifelink deals damage, its controller gains that much life
The biggest feature is probably the card library
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Most decks will want to have at least 10 sources of each of these, so if you're struggling to reach that elusive 100 card total, just remember the three R's: Removal, Ramp and, er, CaRd Draw