Besides a reliable flicker effect, Thassa also makes for a well-sized attacking creature as long as you can get enough blue permanents in play
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Its a great way to dodge removal or protect your setup until the exact right moment
Like most commands, you get to choose two modes out of four, create a copy of target Elf, return two permanents from the graveyard to your hand, destroy a creature or enchantment, or, the big one, give a players creatures +3/+3 and untap them
The trick to making Empty the Pits good in a control deck is finding ways to draw cards or kill your opponents creatures without putting pressure on your own graveyard
Sleeve it like you mean it