In fact, players should inform other players that its a proxy when its not obvious at first glance
Use a unique item that completely fits on Tchotchke Elemental for each knickknack counter
Emperor of Bones This Modern Horizons 3 skeleton combines graveyard hate, +1/+1 counter synergies, and reanimation all in the same 2-mana package
Brink of Madness, one of the five sleeping enchantments (one for each color), was great for discard decks, because during your upkeep, if you have no cards in your hand, it was sacrificed to force target opponent to discard their hand
Action cards of the Steel Ink type also have strong effects, dealing damage in copious amounts, so players will want to form a strategy that can combine Glimmers with Actions in their turn to really hurt their opponent