Allons-y! — Whenever you attack, exile cards from the top of your library until you exile a nonland card. Put three time counters on it. If it doesn't have suspend, it gains suspend.
Timey-Wimey — : Time travel three times. Activate only as a sorcery. (For each suspended card you own and each permanent you control with a time counter on it, you may add or remove a time counter. Then do it two more times.)
Attack each turn to exile the top of your library and suspend a nonland card with three time counters, then accelerate those counters with Timey-Wimey (or other time-counter manipulation) to cast a stream of free spells. Pair The Tenth Doctor with a Doctor's companion for an extra command-zone body, build a low-curve spell-heavy deck so the suspend hits land, and snowball card advantage into burn, big payoffs, or an extra-combat finish.
Generates real card advantage and free spells every single combat without spending mana
Naturally pulls toward cheap impactful spells, so suspended cards come down fast
Timey-Wimey lets you cheat the wait, casting suspended cards the same turn
Pairs with a Doctor's companion in the command zone for added consistency and value
Rewards an aggressive, proactive game plan that pressures the whole table
Needs to connect in combat to trigger value, so it folds to fogs, removal, and gummy boards
Five mana and fragile—repeated commander removal taxes the deck heavily
Suspend exiling lands does nothing, punishing land-heavy or top-heavy curves
Timey-Wimey at seven mana is slow and only relevant once the engine is online
Variance: you can exile cards you'd rather not random-cast off suspend
Legendary Creature — Time Lord Doctor
: Time travel three times. Activate only as a sorcery. (For each suspended card you own and each permanent you control with a time counter on it, you may add or remove a time counter. Then do it two more times.)