Unbounded Potential is a common Instant card from The List (PLST), collector number MH2-36. Current market price: $0.16, TCGplayer market prices via Scryfall.
Choose one — • Put a +1/+1 counter on each of up to two target creatures. • Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.) Entwine {3}{W} (Choose both if you pay the entwine cost.)