Cards like Earthcraft can allow you to trade your creatures for untapping your lands, essentially increasing your mana pool by the amount of creatures you control
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Make sure to include them in your deck when you can
Its a Blue Sorcery that reads, Each opponent exiles cards from the top of their library until that player has exiled cards with total mana value 20 or more. Its only not as good in Commander because people tend to have higher mana curves, but itll still make everyone other than you sad
Also, with one of the Scout creatures, a bounceland and Retreat to Coralhelm you can generate infinite landfall triggers even for the combo kill
Immersturm Plane Valla Whenever a creature enters the battlefield, that creature's controller may have it deal damage equal to its power to target creature or player of his or her choice