A classic example of this type of board complexity card that many players don't think of as being complex is Prodigal Pyromancer (and his predecessor, Prodigal Sorcerer) The reason Prodigal Pyromancer creates board complexity is because in combat he has the potential to change the math of any fight
There is a full list of each card available as well as a deck-building section, so players can create a virtual deck in the app, review it, and then recreate it with actual cards.
See rule 702.185, Warp. 702.185a: Warp represents two static abilities that function while the card with warp is on the stack, one of which may create a delayed triggered ability
There are some benefits to selling Pokmon cards via multiple platforms, especially if you're buying and selling, since this gives you the best chance of finding disparities and selling a card for a higher price than you bought it for
Many collectors still remember old cards from this era