mtg cards in graveyard gain flashback Snapcaster Mage (Regional PTQ) [Pro Tour Promos] The flashback cost is equal to its mana cost Sphinx of Forgotten Lore

Check Lands Any dual land that can enter untapped on a regular basis is a pretty good option for mana fixing in Commander

You can try and build around them and turn it into a Voltron commander, but limiting your options to do this with a red commander might prove challenging

All by itself, a 2/2 with vigilance that can tap for two mana is already borderline playable in Commander, but in a deck with three or more colors the card just gets bonkers

The RNN knows that lands make mana, and knows that non-basic lands generate combinations of mana

Warrior's Oath and friends give you a Time Walk, which we all know is busted, but you lose at the end of the extra turn