CardName: Gigantwave Ray
Cost: {5}{U}{U}
Type: Creature - Fish
Pow/Tgh: 5/5
Rules Text: Players can't untap X lands during their untap phase, where
X is the number of tapped creatures they control.
Whenever Gigantwave Ray deals combat damage to a creature
tap that creature. It doesn't untap during its controller's
next untap step.
Flavour Text:
Set/Rarity: Multiverse Design Challenge Mythic
Gigantwave Ray
M
Creature – Fish
Players can't untap X lands during their untap phase, where X is the number of tapped creatures they control.
Whenever Gigantwave Ray deals combat damage to a creature tap that creature. It doesn't untap during its controller's next untap step.
See Challenge # 131.
It took me a bit on how to upgrade an ability based on tapping from uncommon into mythic territory