There are two that come to mind, with one being from the Brilliant Stars set, where Vaporeon is in a pool of water alongside Gary
A lot of these decks will be playing super equivalent small guys, attacking and blocking will often mean setting your board back to 1 or maybe 0
Marchesa Budget Starters Adding more cards with the monarch mechanic is perfectly on-theme, and helps you steal back the monarch without necessarily having to attack for it
Neither the stickers, nor the art cards command any real financial value, although you can put all of the art cards together to form a panorama of five Mega Pokmon powering up - so it's got that going for it, I guess
But it's not broken, so despite the fact that you can grab any land from your deck, it just heads to your hand
Similarly, it can't be attacked and damage can't be dealt to it