Mindspring Merfolk is a rare Creature — Merfolk Wizard card from Aetherdrift Promos (PDFT), collector number 51p. Current market price: $0.63 (foil $0.67), TCGplayer market prices via Scryfall.
Exhaust — {X}{U}{U}, {T}: Draw X cards. Put a +1/+1 counter on each Merfolk creature you control. (Activate each exhaust ability only once.)