Storm Elemental — ruling 1

Even though the two activated abilities have the same cost, they’re separate. You choose which one you’re activating before you exile the top card of your library (and see what it is).

Storm Elemental — ruling 2

If you activate Storm Elemental’s third ability and the exiled card is not a snow land, the ability has no effect.

Storm Elemental : règles, fonctionnement et interactions (MTG)

Storm Elemental is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Flying , Exile the top card of your library: Tap target creature with flying. , Exile the top card of your library: If the exiled card is a snow land, this creature gets +1/+1 until end of turn.

How it works : Storm Elemental

Original English text — Wizards of the Coast / Scryfall

#1October 1, 2008· Wizards of the Coast
Even though the two activated abilities have the same cost, they’re separate. You choose which one you’re activating before you exile the top card of your library (and see what it is).
No other card is named in this ruling.
#2October 1, 2008· Wizards of the Coast
If you activate Storm Elemental’s third ability and the exiled card is not a snow land, the ability has no effect.
No other card is named in this ruling.