"Our forebears once flew like this—carefree, needing nothing but a warm nest and a full belly. Our intellect may be more burden than blessing." —Commander Eesha
Threshold — As long as seven or more cards are in your graveyard, Vigilant Sentry gets +1/+1 and has "{T}: Target attacking or blocking creature gets +3/+3 until end of turn."
Look at the top X cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order. Flashback—{1}{U}, Exile X blue cards from your graveyard.
Enchant creature Enchanted creature can't attack or block, and its activated abilities can't be activated. Its controller may exile three cards from their graveyard for that player to ignore this effect until end of turn.
Permanents don't untap during their controllers' untap steps. At the beginning of each player's upkeep, that player chooses a permanent for each card in their graveyard, then untaps those permanents.
Flying Whenever Scalpelexis deals combat damage to a player, that player exiles the top four cards of their library. If two or more of those cards have the same name, repeat this process.