For casual play and playtesting, many groups allow proxies if everyone agrees and the cards are readable
Naturalize destroys an artifact or enchantment in a Ghave, Guru of Spores deck, but Sundering Growth and Seed Spark are probably better cards that build on the token theme of the deck
Tri-Brigade is an archetype that can function on its own as a deck, but also can be paired with any beast, winged beast, or beast-warrior deck
If it's a wind-up tee type, I recommend 3 stacks, and other types can also be used simply as a rank 4 from Warrior Revive or a removal from Nyanko Revive
It's important to include enough cards that can end the game, or at least push your deck's primary strategy forward so that you'll reliably have access to these cards