Most TCGs operate under the same basic rule of players trying to get as many cards from their decks into their hands as quickly as possible
Shamarun Cloner [DARK] LV 3/Reptile/Effect ATK/600 DEF/1400 During the Main Phase: If this card is in your GY, you can Special Summon this card from your GY to your opponent side of the field, and if you do, Special Summon up to 3 Shadslime Token to your side (DARK/Reptile/LV 2/ATK 0/DEF 100), also, if this card leave the field after used this effect, banish instead
Even if your foe tries to retreat their damaged Pokemon to the bench they will likely still have at least one or two Energy left on them for you to finish them off
Shilgengar's famine once starved Stensia into embracing vampirism
Theres also an even rarer variant exclusive to leader cards: the Showcase variant, which features alternate art, a unique frame, and special foil treatment