129 pokemon card JP 151 [SV2a 129/165] 'Magikarp C' SV2A-129-165-JP Colorless Power Blast (120) Discard an Energy from this Pokémon Mewtwo ex (gapo-129) - PokemonCard

Palace Jailer also prevents you from quickly losing the monarchy

Just like Supporter cards, each player can only play one Stadium card during their turn

Getting paid for the cards in cash or credit

Pair it with cards that grant evasion like Whispersilk Cloak or bypass blockers with something like Key to the City

There are no shortages of powerful Dinosaurs that you can cheaply cast (such as Pugnacious Hamerskull, which is also in The Lost Caverns of Ixalan), which lead to Belligerent Yearling becoming a massive threat by turn three by copying their power and toughness

I think people were looking for something different