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While its not the primary feature of the card, Leyline of Abundances activated ability should be useful nevertheless

If tapping a creature using convoke wouldn't pay for any mana in that spell's cost (because you've already paid for all of the mana in the spell's cost by tapping other creatures or because you've already paid for all of the generic mana in the cost by tapping other creatures and the creature you want to tap doesn't share a color with any of the remaining mana symbols in the spell's cost), you can't use convoke to tap that creature

That kind of effect changes the whole rhythm of a game because the opponent can no longer plan attacks as cleanly as they would against a normal leader

Minds Eye can help you keep up with the blue player at the table, or just draw an extra card per turn for a single mana

Simic Growth Chamber