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Whenever you cast a blue spell, if Hydro-Man is a creature, he gets +1/+1 until end of turn. At the beginning of your end step, untap Hydro-Man. Until your next turn, he becomes a land and gains "{T}: Add {U}." (He's not a creature during that time.)
Sep 19, 2025 · After the triggered ability resolves during your end step, however, you may tap him for {U}, even if he entered the battlefield this turn.
Sep 19, 2025 · The effect of Hydro-Man's last ability ends as your turn begins. There is no opportunity to tap Hydro-Man for {U} once your turn has started.
| Archetype | Format | Inclusion | Copies | Decks (n) |
|---|---|---|---|---|
| Mono Blue Control | Standard | 100% | 2× | 1 |
| Izzet Spellementals | Standard | 45.2% | 1–2× | 104 |
| Izzet Prowess | Standard | 10.1% | 1–2× | 208 |
| Izzet Midrange | Standard | 9.1% | 2× | 11 |