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It protects your 3/1 from sorcery-speed removal and most sweepers for free, since that Evangel you discarded was going away no matter what

Whats better than Rainbow

The chance to receive one of nine exclusive promo cards adds an element of excitement, while the booster packs provide endless possibilities for expanding your collection

I think Endless One could be fine in a deck that has a focus on the +1/+1 counters on your creatures with cards like Avatar of the Resolute, but as a big payoff spell, the other options are miles better

Spymaster's Vault has a similar trick, where you can activate Verminister, then activate the Vault to connive away extra Rat Colonies