I love including Swiftfoot Boots and/or Lightning Greaves here to protect Krenko and use it earlier
Enough mana to cast [[Shorikai, Genesis Engine]] quickly
Mystic Subdual Mystic Subdual ranks higher than the other generally-more potent removal in the Limited pool for the simple reason that it shuts down all abilities on its target
2 The Moxen - Alpha Edition Rare - ~$6,000 There are plenty powerful artifacts in Magic, and few are as exceptional as the Moxen
According to retail prices, the most valuable (non-foil, non-special printing) card you can open day one of Foundation's release is everyone's favorite carrot top vampire, Bloodthirsty Conqueror
Sure, it might not stick around more than four turns because of the cumulative upkeep, but during that time the common Forces would eagerly serve up a healthy dish of twelve to sixteen damage unopposed