older pokemon booster boxes Pokémon Mystery Box (vintage chance) Vintage & Sealed Pokémon Booster

When it enters or attacks, it deals 3 damage to any target and you gain 3 life

However, Arabian Nights cards are very popular, as well as cards illustrated by Dan Fraizer

This card can pump out your other powerful gem knight fusions with ease which will then trigger their own effect that could easily overwhelm your opponent snowballing them out the game

Some generic side choices you could use are Maxx "C", Prohibition, Soul Taker, Nobleman of Crossout, Puppet Plant, and Dimensional Prison

This actually works better if you lay your card in the sleeve before taping

Legendary Creature - Human Warlock Sac Outlet (CTRL to add secondary) Tokens Felisa, Fang of Silverquill Flying Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.) Whenever a nontoken creature you control dies, if it had counters on it, create X tapped 2/1 white and black Inkling creature tokens with flying, where X is the number of counters it had on it