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If I want to use Lochmere Serpent's first ability, can I tap an island for mana and sacrifice the same island?

{U}, Sacrifice an Island: Lochmere Serpent can't be blocked this turn.

3

Yes, you can do this.

All islands have the (unwritten) ability of Tap: Add {U} to your mana pool. You can activate this ability any time you have priority. You simply tap the land to get {U} in your mana pool, which will remain there throughout the current step/phase. You can then spend that {U} and sacrifice your now-tapped Island to pay your Serpent's ability cost.

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    You can even tap the island you want to sacrifice as part of the process of playing the ability, rather than beforehand (a non-priority possibility to activate mana abilities is part of the process of casting spells or activate abilities) (this is why some mana abilities have the restriction "only activate any time you could play an instant"). Doing it that way may be handy if, for instance, you want to circumvent certain triggered abilities, like Mine Layer – Arthur Jun 20 at 5:31

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