Ideally, you'll only play Innkeeper's Talent once you already have a creature on the board so that you can immediately get value out of the counter it provides when you go to combat
If you can find a way to keep your main attacker healthy, while still accelerating Energy, you'll be near unstoppable with Metagross
Enchantment Royal Decree Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) Whenever a Swamp, Mountain, black permanent, or red permanent becomes tapped, this enchantment deals 1 damage to that permanent's controller
Double-sleeve your best pulls
Most singles will not rise at the same rate as their graded 10 counterparts, and singles prices are the most volatile out of everything in the hobby
Once it's used, it cannot be used again for the rest of the game unless the creature is removed from the battlefield and returned to it