play a card from exile mtg Path to [Wizards Network 2009] All cards will be carefully packed for safe transit. Any cards that can play

Haldan, Avid Arcanist + Pako, Arcane Retriever Haldan, Avid Arcanist and his dog Pako, Arcane Retriever are a fun Temur-aligned partner pair with a steal your opponents' stuff theme

for example, your cool counterspell should be blue, your hasty creature is likely red, a card that cares about power is green, and so on

Historically this was things like Skirk Prospector and Sledder to empower untap triggers and Goblin Warchief to get them online quicker and safer

While Im not sure if it truly makes the cut in cEDH, you could also cast Return the Favor to make your own copy of the enters-the-battlefield ability of Thassas Oracle to win on top of their ability on the stack