Paradox Zone is a rare Enchantment card from Commander 2021 (C21), collector number 391. Current market price: $2.12, TCGplayer market prices via Scryfall.
This enchantment enters with a growth counter on it. At the beginning of your end step, double the number of growth counters on this enchantment. Then create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it, where X is the number of growth counters on this enchantment.