What does Magosi, the Waterveil do?
user
Magosi, the Waterveil enters tapped.\n{T}: Add {U}.\n{U}, {T}: Put an eon counter on Magosi, the Waterveil. Skip your next turn.\n{T}, Remove an eon counter from Magosi, the Waterveil and return it to its owner's hand: Take an extra turn after this one.
assistant