Though it banishes itself if it leaves the board after the latter, using it for a Rank 6 Xyz play circumvents this
However, there is also no limit to how often or how many times you can change the language of your game, so you can use this to your advantage to collect cards of a specific language, or even build up a mixed collection of cards featuring a variety of different languages
when you only get one shot at replaying your lands, filling your graveyard with self-mill or discard effects is a must while the latter category can do plenty with a single fetch land
While the tribute cost is steep, running Obelisk is a necessity
If youve been playing, testing, or trying out Harpies, let me know in the comments or on twitter @mattcarterwa!
I have tried this build with Delphox, and it sure provides huge late game power