Steel Overseer [Kaladesh Inventions] Troll the player can activate mana

the player can activate mana abilities only if they're from lands that player controls and only if mana they produce is spent to activate other mana abilities of lands the player controls and/or to play that card

waiting for a victory only it can see

tap Yawgmoth Demon and it deals 2 damage to you

"Here sprouted the first seedling of Argoth

Steel Overseer [Kaladesh Inventions] Troll the player can activate manaSet: Kaladesh Inventions Type: Artifact Creature Construct Rarity: Mythic Cost: {2} {T}: Put a +1 +1 counter on each artifact creature you control. In an unusual foray into the humanoid form, Venand Kapurknown as the Gearherderbuilt this automaton to keep watch over his clockwork herds.