The drawback is its triple-blue mana cost, meaning almost all of your lands in your deck have to tap for blue for you to cast this card reliably
The flavor text being "I normally charge for my merc services, but I can't just say no to someone who controls their commander." Another card is literally entitled Trading Card "so you dont forget," and gives you the ability to exchange its text box with that of another creature
Or maybe you have a tribal tribal deck
If you are in the energy deck, however, then this is just a threat that has to be removed, preferably on the stack, before you make 10 beefy Robots that will define combat for the rest of the probably very short game
Wrap Up Swamp (Game Night: Free For All) | Illustration by Paul Scott Canavan You ultimately have to decide whether or not the most recent entry in the Game Night series is worth the investment for you
On a more positive note, I think he was the good guy for a while when Simic Flash was on a rampage, and he does shut off Embercleave, so he has that going on