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Explorers of the Deep - Lost Caverns of Ixalan This Simic (Blue/Green) deck is helmed by Hakbal of the Surging Soul, and uses the Explore mechanic to great effect, either ramping your lands, netting you creatures, or getting card draw

if you run out of cards in your deck and can't draw on your next turn, you lose

With a commander like Brago, King Eternal, you can even create infinite blinks if your mana rocks make 2 or more mana when they re-enter, letting you repeat your best effects over and over until your opponents concede

The card saw occasional fringe play in Standard when Zendikar Rising was still a part of the format

And thats the sort of deck that can protect a planeswalker, which makes Serra the Benevolents ultimate seem like a real possibility at certain tables