Phalanx Formation | Instant | | Strive — This spell costs {1}{W} more to cast for each target beyond the first.
Any number of target creatures each gain double strike until end of turn. (They deal both first-strike and regular combat damage.) | Dan Scott
Hour of Need | Instant | | Strive — This spell costs {1}{U} more to cast for each target beyond the first.
Exile any number of target creatures. For each creature exiled this way, its controller creates a 4/4 blue Sphinx creature token with flying. | Jesper Ejsing
Polymorphous Rush | Instant | | Strive — This spell costs {1}{U} more to cast for each target beyond the first.
Choose a creature on the battlefield. Any number of target creatures you control each become a copy of that creature until end of turn. | Ryan Barger
Nightmarish End | Instant | | Target creature gets -X/-X until end of turn, where X is the number of cards in your hand. | Willian Murai
Colossal Heroics | Instant | | Strive — This spell costs {1}{G} more to cast for each target beyond the first.
Any number of target creatures each get +2/+2 until end of turn. Untap those creatures. | Seb McKinnon
Consign to Dust | Instant | | Strive — This spell costs {2}{G} more to cast for each target beyond the first.
Destroy any number of target artifacts and/or enchantments. | Andreas Rocha