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Rainbow Vale can tap for one mana of any color, but then, an opponent gets control of it

Since it takes so many counterspells, removal spells, and planeswalkers to keep the game in check, there often isnt much space in the deck for creatures

Planeswalker decks are already quite strong once they are able to get going (see Atraxa, Praetor's VoiceAtraxa, Praetor's Voice for that), and once we get extra time thanks to Pramikon, we will be able to snowball out of control quickly, especially with planeswalkers like Chandra, Awakened InfernoChandra, Awakened Inferno, Elspeth, Sun's ChampionElspeth, Sun's Champion, and both Will KenrithWill Kenrith and Rowan KenrithRowan Kenrith at our disposal

Then if you control ten or more creatures, you may play the exiled card without paying its mana cost