I used to frequent TGW in Gaines Township for all my Magic: The Gathering cards, and these days, they still have all kinds of trading cards, including Pokmon cards
You can only use each effect of "The Phantom Knights of Ancient Cloak" once per turn
You can use the effect once per turn, too, so you can literally tear down your opponent every turn with this effect, as long as you keep tributing dark monsters
Lower Text - Promo Info EXTRA BOOSTER DAWN OF LIBERATOR [EX-11] CLOSECLOSE EX11-044 SR Digimon Lv.6 Parallel Rare Pyramidimon Color Black Form Mega Attribute Virus Type Mineral/LIBERATOR DP 12000 Cost 11 Digivolve Cost 1 3 from Lv.5 Digivolve Cost 2 - Upper Text Reboot Fragment 3 [On Play] [When Digivolving] [When Attacking] [Once Per Turn] By trashing any 3 [Mineral] or [Rock] trait cards from your Digimon's digivolution cards, delete 1 of your opponent's highest play cost Digimon or Tamers
If a monster(s) in your hand or you control is Tributed, or destroyed by battle or card effect: You can add 1 "Amorphage" card from your Deck to your hand
Honestly, youre rarely going to encounter that ability used outside of Commander games, but its one hell of a flex whenever you do see it