Good luck!
1. f4
I think this is an invalid move from this position.
From my understanding, only the attack-mode Metamorph is transparent; and main-mode Metamorph causes transparency on adjacent squares.
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Normal Form
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All adjacent squares are transparent to friendly pieces, but not the metamorph itself.
Attack Form
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Yellow squares are transparent to friendly pieces. (In attack form it becomes transparent, as opposed to the squares around it in normal form)
This is a bulldog match between @evert823 (white) and @Marks1420 (black). It is part of the Random Dog Tournament.
Pieces include: Bulldog, Metamorph, Time Thief, and Witch.
Time control is three days per move, with three 24-hour time warnings that refresh every 40 moves. One 14-day vacation can be requested every 40 moves.
Good luck