Bramble Sovereign

The clever part is the optionality buried in a payment, not a static replacement effect. Cloning engines usually copy on a trigger you cannot decline, or chain off your own spells; this one offers a per-creature toll of that you choose whether to pay each time another nontoken creature enters, yours or otherwise. That structure does two distinct jobs at once. As a value engine it doubles your best enters-the-battlefield bodies one at a time, mana permitting, so the ceiling scales with how much green you can dump in a turn rather than capping at a single copy. As a political lever it lets you fork an opponent's creature to that same opponent's benefit, which is the kind of generosity that buys time at a table where everyone is watching everyone else. The "that creature's controller creates a token" wording is the load-bearing detail: the copy lands under the control of whoever controls the original, so handing out value is built into the card's grammar, not a quirk to play around. The 4/4 body for four is incidental; nobody runs this to attack. What it really wants is a board where every creature you care about has a triggered ability worth firing twice, and enough untapped mana to keep saying yes. The friction is purely economic: each optional payment competes with casting the next creature, so the card rewards a deck built to flood the board cheaply and then pay to echo the pieces that matter.