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Triggering your lifegain payoffs is often worth more than one Treasure, and incidental lifegain in casual EDH is always good

I like the interaction between the Manaform Hellkite and the Fable of the Mirror-Breaker Flip you've set up, but maybe this would make it more effective

Shadowblood Ridge

(9/29/2017) In a multiplayer game, if a player leaves the game, all cards that player owns leave as well, and any effects that give the player control of permanents immediately end

As a baseline thats just kind of what Magic is these days, but I mean more thematic stuff like Oath of Jace

The more fetches you crack, the bigger your Knight becomes, and it'll be a force very quickly