Repeated instances of Swords to Plowshares, Path to Exile, Brainstorm, and Commence the Endgame close things out quickly
Also, the ramp effect is not to underestimate, giving tempo decks mana advantage in the early turns will lead to more spells being played and increases the disruption and threat density tempo can represent to close out the game even more quickly
With the anthems and +1/+1 counters in the deck, its likely to be more than just three damage
This bundle includes an oversized spindown life counter, a whole nest of FINAL FANTASY Play Boosters, and more
Cyclonic Rift is more promising, though competition with Cryptic Command and Into the Roil is very tough and probably unfavorable for the newcomer
This is particularly relevant against the creatures that provide incremental value every turn that this format is full of: Oculus, Manifold Mouse, Emberheart, Preacher, Tersa, etc