Prowess vs Protection What if your prowess creature has protection from the spell you cast
9 Resurrection Orb The Resurrection Orb is a nifty little equipment that could be a nasty problem in the right deck
Counter Blitz Counter Blitz puts you deep into the action right away with lots of different counters and ways to increase their number
This list isn't gospel, you shouldn't run all of these cards in all of your decks, but you should be looking at them to take up those slots in the 99 that aren't just Wrath of God, Damnation, or any other yawn-inducing card that is generically good, but might not actually be the right fit for you.
Tidus rewards you for doing this by letting you draw cards and proliferate (add more counters), while his partner Yuna helps get your creatures on the board with extra counters to start
If youre running a cheap commander with evasion or an easy way to gain double strike, and you really hate ramp decks, consider Destructive Urge
