Yes, your opponents do have the option to pay a tax and deny you the card advantage, but especially in the early turns you can count on the mana efficiency of cEDH (and the hatred of taxes by its players) to routinely draw you some cards
The Naya (white/red/green) deck, Call for Backup cares about +1/+1 counters, and also shows off the new backup keyword from March of the Machine
the upside for something wild happening when the spell resolves is high
With the right synergies, Garnet is Aerith-esque
If the resolution of a triggered ability involves casting a spell, that spell can't be cast if a spell with split second is on the stack
For this reason, taking time off in the developing stages of a game to ramp doesnt tend to leave the shields down as much as it would in a more cutthroat environment