pokemon sword & shield astral radiance booster box Pokémon TCG: Shield-Astral Display (36 Packs) which will be either a basic Energy or a VSTAR marker Pokémon TCG: Astral Radiance Booster

Doubling Season Size 8.8cm x 6.3cm, Fit perfectly into KMC perfect fit sleeve

The Earth Crystal The Earth Crystal is an interesting mashup of an Emerald Medallion and a card that doubles +1/+1 counters on creatures

Post-board they have some sweepers, but those are definitely beatable

For alt art cards, its important to pay attention to the pattern and texture of the card, as counterfeit cards often have irregularities in these aspects compared to genuine cards

TCG Grading Tool can easily manage and evaluate your cards effortlessly

If you really wanted to reinforce Unions as a whole to compete with the current meta: I would say something like "Target 1 Union monster from your hand, Deck, or Graveyard: Special Summon 1 monster whose name is included in the card text of that card from your Deck or Graveyard