Tifa Lockhart

To double Tifa Lockhart's power, it gets +X/+0, where X is Tifa Lockhart's power when the landfall ability resolves.

A landfall ability doesn't trigger if a permanent already on the battlefield becomes a land.

Whenever a land you control enters, each landfall ability of 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.