My Crushing Masterstroke (Schemes) [Archenemy Schemes] Kobold Activate only if a player

Activate only if a player has one or fewer cards in hand and only as a sorcery

Set: Rivals of Ixalan Prerelease Promos Type: Legendary Creature — Elder Dinosaur Rarity: Mythic Cost: {6}{R}{G}{W} Vigilance

Set: Wilds of Eldraine Promos Type: Creature — Human Wizard Rarity: Rare Cost: {X}{U} Skulk (This creature can't be blocked by creatures with greater power

Set: World Championship Decks 2000 Type: Land — Rarity: Rare Whenever City of Brass becomes tapped

What am I to do

My Crushing Masterstroke (Schemes) [Archenemy Schemes] Kobold Activate only if a playerSet: Archenemy Schemes Type: Scheme Rarity: Common When you set this scheme in motion, gain control of all nonland permanents your opponents control until end of turn. Untap those permanents. They gain haste until end of turn. Each of them attacks its owner this turn if able.