For two mana you can counter the biggest threats to colorless: Sorceries like Vandalblast or Damnation or Farewell
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Based on the latest market prices tracked on TCG Stacked, Mewtwo-EX is worth about $61.90 USD
Apart from mutate cards to trigger that ability, I guess you could use Stuffy Doll and Brash Taunter, or fill your deck with cards that grant abilities to your commander like backgrounds and the legendary familiars (Kediss, Falthis, et al)
You do get to see an extra card compared to [[Collected Company]], but this is the benefit for not being a get to get creatures
Plan 2: Spell Mill Let's get this out of the way first: Compelling Argument is a horrible card
