If a spell with rebound that you cast from your hand doesn't resolve for any reason, including being countered, the spell will be put into its owner's graveyard and you won't get to cast it again on your next turn
Todays reveal gave us both Scavenger Grounds and Endless Sands
Once you get a good-sized stack, you can quickly reference a vendor buylist or MTG Dawnglare
Celestine does require you to gain life before you can start bringing creatures back, with so many ways to efficiently gain life in Commander this isnt a problem at all
, the games core constructed meta will sunset every set from the games second year, which means sets five through eight
That alone is quite strong, but since it distributes a "Grave Pact" effect to other deathtouch creatures, creature combat becomes quite hopeless