Creatures that get +1/+1 counters easily, especially when other creatures die
Examples include: Aromatic G Energy
With cheap creatures, Dryad Arbor, blinking Nadu, or any number of other tricks, it's pretty easy to use Shuko and Nadu to get through your entire deck
S-Tier decks: Charizard ex, Redidrago VSTAR, Raging Bolt ex, Iron Thorns ex, Miraidon ex, Gardevoir ex, Roaring Moon/Flutter Mane Ancient Box, Dragapult ex, Lugia VSTAR, Palkia VSTAR, Terapagos ex, Roaring Moon ex A-Tier Although these decks aren't surefire winners in every Pokemon TCG battle, they do have great chances of victory, albeit not as much as some of their S-Tier counterparts
Note: Some deck-exclusive and league promo cards are reprints, with their original expansion symbol and collector number but a different rarity