black yugioh card YU-GI-OH! - Illusion (YGLD-ENC00) - Yugi's Legendary Decks - Limited Edition Super Rare Attack Black Thunder - Yu-Gi-Oh! Card

If you don't, you spent six mana to barely make an impact, and if you do, you could have just won without it by casting another creature instead

Slaying Mantis fights each creature one-on-one in a handicap match

Universal Compatibility: Specifically designed to store and protect a wide range of collectible cards from sports like baseball, basketball, football, as well as trading card games such as Magic The Gathering and Pokemon

This type of effects can either be a way to balance the power of your Pokmon or part of some mechanic aimed to make them more effective (for example increasing the damage of their next moves)