This slot goes out to all the pingers that toss a point of damage around when an opponent draws a card
In addition to the obvious things like Syphon cards (do some effect to each other player, gain benefits depending on how many other players this hit), there are cards that affect a random opponent, cards that give everyone the game the ability to join forces to create a big effect (for example, a sorcery that lets everyone pitch in mana and then lets everyone put lands into play from their decks), and Enchant Creature cards sorry Auras that boost the creature while preventing it from attacking to
They should be around $7 USD each, or you can pick up a box for a little over $200
While it breaks the tribal rule by not being a Myr, Id strongly consider running Blast-Furnace Hellkite as a potent combat trick, given how many artifacts Id have available with all the Myr in the deck
Specifically, Jace's mana value is always 4
I also chose creatures that work well in a typical enchantments-matter deck