mtg exile cards from the top of your library until Jodah, Unifier (PDMU) #203p Natural Reclamation

In the early game it's just a five-mana Damnation, and in the mid-game it's an okay sweeper with a few dorks, later you can play around it and really push the board your direction

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If your Commander costs four mana, then this will likely be a fair mana spent to give a +4/+4 boost and this fits

(And if you're still learning, even better, as MTG Arena is excellent for new players!) They have Sealed events starting June 25, and the play experience is still the same, great Magic

You find this spell most often in combo decks, notably Legacy Reanimator, that want to check for interactive spells like Daze and Force of Will

Theres also something fun about making your opponent make the call on the flip that could decide the game