The mana created by Meeting of the Five can be spent on any portion of the cost for a spell with exactly three colors, including any generic cost component or additional costs it has
I use Intangible Virtue, Dramatic Finale, and Teysa Karlov (EDH Teysa, anyone?) to turn those nasty tokens into beat sticks you can throw around the board willy-nilly
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1 of 1 is a bit weird to me, once it has been obtained (and revealed), all other sealed product should take a hit in value (no idea how this affects things in the sports market though, can someone shed some light?)
Blinkmoth Nexus was another strong addition that gave giving fans of creature lands something new to work with
Green Evolutionary Leap I love sacrifice outlets, and Evolutionary Leap provides an inexpensive one while giving additional value