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
Relay Soul sounds like a problematic and powerful combination when it can be drawn into, along with you being able to take down the monster, along with your opponent having the incredibly easy scenario of having a monster to Summon, so assuming rulings don't disable it completely (which they could due to the unexplored nature of these effects), I still think it feels wrong to favor it over this
Thanks to cards like Predaplant Verte Anaconda, it's easy to get out onto the field as well, only needing any two effect Monsters.
One of the most famous Blue cards in existence, too strong for Standard, but (mostly) too weak for Legacy, has finally come home to Modern
The excitement is guaranteed in each duel, and you'll find attractive graphics that can support 4K resolutions on compatible smartphones