how many cards in a pokemon booster box Assorted boosters: 4 Packs : Toys & Games More than 20 brand Pokémon TCG: 8 Priciest Modern

There are lots of already playable cards that get counters on creatures (Profts, Sentinel of Nameless City, Qarsi Revenant)

It's a level 10 Ritual Monster, but I don't think it's difficult to perform a ritual summon if you use Impcantation Candolland Impcantation Talismandra

Clorless, Chaos King of Dark World X DARK Level 12 [ FiendFusionEffect ] ATK

you can even find a Mario Pikachu card released in 2016 as part of a crossover campaign with Mario.

Riku of Two Reflections Since Riku of Two Reflectionss ability triggers when a creature enters, you can use cards like Thassa, Deep-Dwelling and Essence Flux to generate many copies of one card

Weakness: none Resistance: none Retreat: 3 Zeraora VMAX - Lightning - 320 HP Pokmon - VMAX - Evolves from Zeraora V LL Reactive Pulse 60 This attack does 60 damage for each of your opponent's Pokmon in play that has an Ability