(Jasconian Isle isn't a spell, it's affected by summoning sickness, it's blue, and it has ": Add
.")
Jasconian Isle enters tapped.
Jasconian Isle doesn't untap during your untap step.
At the beginning of your upkeep, you may pay . If you do, untap Jasconian Isle.
Illustrated by Aaron Reed · Mystery Booster Playtest Cards 2021 · #117
2019-11-12
If Jasconian Isle is changed into another basic land type (such as by Cyclopean Titan), it continues to be a 3/4 creature and a Fish, but it loses all of its abilities.
2019-11-12
This card will have a blue color indicator, which will make it blue. That’s why the reminder text says so. Color indicators are added later in editing.
2019-11-12
Playing Jasconian Isle as a land uses a land drop, the same as playing an artifact land or enchantment land.
2019-11-12
If an effect allows you to cast a creature spell, you can’t play Jasconian Isle that way.