mtg card that makes all lands swamps Swamp (34) [Duel Decks: Phyrexia vs. the Coalition] The Lotus Lands, as a

Silkguard Silkguard combines counter synergies with hexproof

Power Fist Exxaxl: A card like this would usually be limited in utility because you need trample for it to work, but they actually put trample on the aura itself which seems wild

Faithless Looting Faithless Lootings flashback is great for red decks that need to shape up their hand or graveyard

8 Miraris Wake A real Commander classic, Miraris Wake provides two powerful effects in one spherical package: an Anthem effect for all of your creatures, and a mana-doubling effect for all of your lands

For example, if you have 3 life and an effect says that your life total "becomes 10," you would gain 7 life which The Wind Crystal doubles to 14, so your life total will actually become 17

The boros variant that came to my mind works with Gargadon and Stuff like Rukh Egg, as well as with floating mana like Upheaval