While that sounds dangerous, you draw cards whenever a creature you own but dont control attacks, turning your rather useless creatures into card advantage
In Lorcana, one of my favorite mechanics is the song mechanic
They will adjust prices if you buy something and it later goes on sale within the return period
The combination of flying and lifelink gives Teval natural staying power, but the real draw is its blanket delve effect, letting you turn every spell into a miniature Treasure token by cashing in cards from your graveyard
It gets better with self-mill effects and evasive creatures, and youll eventually get to cast instants and sorceries from your hand for free
Part Birds of Paradise, part Scavenging Ooze, part Grim Lavamancer, the Shaman was banned in Modern and Legacy but never broke into Standard or Pioneer, although a critical mass of pseudo-fetchlands will eventually push it into playability