Best of all, your opponent isnt going to know what you tutored for, and that uncertainty in and of itself is a powerful tool
Its worth noting that Sram, Senior Edificer is a legendary creature, which means he can be your commander if youre building a Commander deck
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
At a Pokmon Center, you can pick up a range of official merch, including plushies, clothes, cards, and even games
The same goes with the red 5-mana 4/4