Tideforce Elemental
, 
: You may tap or untap another target creature.
Landfall — Whenever a land you control enters, you may untap this creature.
Ebb and flow, high tide and low, quick as sand and just as slow.
Illustrated by Donato Giancola
This printing
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A landfall ability doesn't trigger if a permanent already on the battlefield becomes a land.
A landfall ability triggers whenever a land you control enters for any reason. It triggers whenever you play a land, as well as whenever a spell or ability puts a land onto the battlefield under your control.
Whenever a land you control enters, each landfall ability of the permanents you control will trigger. You can put them on the stack in any order. The last ability you put on the stack will be the first one to resolve (As a result, you can have those abilities resolve in the order of your choosing.).
