Hydro-Man, Fluid Felon

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Hydro-Man is a 2cmc UU legend that functions as a 2-mana blue rock (turns into a land tapping for {U} at each end step) while also being a growing threat when blue spells are cast. The land-transformation is uniquely valuable: it's effectively a free tapped land each turn that untaps into a creature again, providing mana and combat presence simultaneously. The UU pip cost limits it to mono-blue or heavy-blue shells, and it shines in spellslinger/tempo where it rewards casting blue spells while funding them as a pseudo-land.

• Hydro-Man's land transformation happens at the beginning of your end step and lasts until your next turn, meaning he acts as a tapped blue land for most of each round — effectively granting a free {U} mana source every turn cycle while still being a creature during your main phases.

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• Because he becomes a land (not just loses creature types), he is immune to creature removal during that window — spot removal like Swords to Plowshares cannot target him while he's in land form.

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• In combo shells, Hydro-Man as a recurring {U} mana producer can help fund spell-heavy turns; note the +1/+1 trigger checks 'if Hydro-Man is a creature,' so instants cast during the opponent's turn while he's still a land do NOT trigger the pump.

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• EDHREC rank: #12,414