Kate Stewart

Time counters are usually a detail of the suspend and vanishing mechanics that no deck bothers to build around; this design turns them into an economy. The first ability rewards you for adding time counters to permanents you already control, spitting out a 1/1 white Soldier every time you do, which pulls a normally incidental resource into a repeatable token engine. Getting there means committing to permanents that gain time counters and to proliferate effects that stack more of them, since suspend itself lodges its counters on cards in exile rather than on the battlefield and does nothing for either ability once those cards resolve. The payoff is a mass pump keyed to the same resource: paying eight when Kate Stewart attacks gives your attackers a bonus equal to the time counters among your permanents, so the counters that fed the Soldier stream also decide how hard the swing hits. The eight-mana cost is the gate that stops the second half from being a free blowout; you need the counters and the mana in the same combat, and assembling both usually means several turns of banking have already gone by. What sets this apart from a generic Jeskai four-drop is that commitment: it is a lord for a resource nobody else was hoarding, asking you to treat time counters as a currency you accrue toward a single explosive turn rather than a curiosity you happen to leave on a card.