If the new artifacts mana value is the same or lower, you dont have to do anything else
But in decks with token production or recursive creatures, thats a small price to pay for the huge boost in survivability and power
Iridian Maelstrom The definition of a true reset button, Iridian Maelstrom clears away every creature that isnt all colors to leave only your rainbow threats untouched
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Proliferate Proliferate is making a comeback with Phyrexia: All Will Be One due to the return of poison counters, and you can also use the ability to increase your experience counters
Also, can use on your own spell in a pinch to draw deeper