Soul Stone

If Soul Stone would become untapped while it has a burden counter, instead remove a burden counter from it.
{t}, {1}, {b}: Target player reveals their hand. You choose a nonland card from it. That player discards that card. Untap Soul Stone.
{t}, {7}{b}{b}, put two burden counters on Soul Stone: Gain control of all creatures until end of turn. Untap them. They gain haste until end of turn.