While a mobile app would make this perfect, it's close as it is
Shes a four mana Black and Green 2/2 that lets you gain two life whenever you sacrifice a Green Creature, and lets you pay two life when you sacrifice a Black Creature, and if you do, your opponents have to sacrifice a Creature too
For in person trades, Im finding that for my needs that trading in person is becoming more and more of hassle
It keeps the card protected in a hard case, confirms its condition, and can increase its market value, since buyers trust professionally graded cards much more
Playing Thrumminbird on turn two comes with an added price in Commander games, though
How much play this will see once it rotates out of Standard remains to be seen, but as of now, it's one of the best adventure cards in MTG