There are lots of little glitches in the game's current build that I hope will be fixed before release
Whenever this creature deals combat damage to a player, destroy target artifact or enchantment that player controls
(2021-04-16) This means that if you cast a spell with demonstrate and both you and an opponent copy it, the opponents copy will resolve first, then your copy will resolve, and finally the original spell will resolve
I believe Tentomon and Betamon remain the only partners teased in the original trailer not to get their own cards
A few cards specifically called out ante, such as Jeweled Bird and Timmerian Fiends, mostly because of how much taking them out could mess up a deck, but for all intents and purposes, starting with the game's original set from summer of 1993, this was fair game