Ekko, The Boy Savior

Phase Dive — 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.

Time Winder — Pay 7: 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.)