Cheapest priced copy (Dominaria): $0.35 at Card Kingdom, near mint, their price list as of .
Keldon Overseer 
Creature — Human Warrior · 3/1 · Common · The List · #DOM-134
Kicker {3}{R} (You may pay an additional {3}{R} as you cast this spell.)
Haste
When this creature enters, if it was kicked, gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
7 rulings from Wizards of the Coast
- 27 April 2018You can target and gain control of an untapped creature with Keldon Overseer's ability. You can also untap a creature you already control and give it haste.
- 8 November 2024If a card or token enters as a copy of a permanent, the new permanent isn't kicked, even if the original was.
- 8 November 2024If a spell's kicker cost was paid, the spell is "kicked."
- 8 November 2024To determine a spell's total cost, start with the mana cost (or an alternative cost if another card's effect allows you to pay one instead), add any cost increases (such as kicker), then apply any cost reductions. The spell's mana value remains unchanged, no matter what the total cost to cast it was.
- 8 November 2024The kicker ability doesn't let you pay a kicker cost more than once.
- 8 November 2024If you copy a kicked spell on the stack, the copy is also kicked. If the copied spell is a permanent spell, the token the copy of that spell becomes when it enters is also kicked.
- 8 November 2024If you put a permanent with a kicker ability onto the battlefield without casting it, you can't kick it.