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Shared Summons is probably the best one, as it can get both creatures, and cards like Eldritch Evolution or Eladamris Call can be reasonable choices, too

Given the generally low mana-curve in Modern, cards exiled with the pirate monkey will usually be castable with the help of the Treasures and almost any card is worth playing as it simply generates card advantage

Mana elves that tap for green mana often charge less than $1 per copy

That said, there is an audience that wants to see incentives to play the fewest colors in Commander and those kinds of answers are not going to be properly seen in a Standard-legal product

Next is Circle of Loyalty, which was made for knight tribal decks and nothing else

Theres also the fact that the distribution for Enchanted cards is roughly 1 in every 72 booster packs, so finding one in a booster is definitely a rare occurrence, even if youre buying full, 24 pack booster boxes