You could also definitely consider adding more Lambholt Pacifists
Grumpy, Bad-Tempered
Bloodbraid Elf, Kolaghan's Command, and arguably Kroxa are all two-for-ones, but they're the equivalent of a burst of nitrous into the engine rather than a fuel refill
Because Magic cards are probably the most liquid, easy-to-sell assets that you own (unless youre involved in commodities markets or drugs or something)
Jace, The Mind Sculptor Oko is far too banned to clinch the top spot, so the prize instead goes to the ever-popular Jace, The Mind Sculptor , arguably the best MTG planeswalker ever printed
A while ago I wrote about how an average d20 roll with Ancient Copper Dragon in a Zirilan of the Claw deck can result in a one-turn kill, and thats just my weird junk combo