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1 Ill-Tempered Loner

The same goes with the red 5-mana 4/4

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

Best of all, your opponent isnt going to know what you tutored for, and that uncertainty in and of itself is a powerful tool