Thickest in the Thicket is a rare Enchantment card from Bloomburrow Commander (BLC), collector number 34. Current market price: $0.44, TCGplayer market prices via Scryfall.
When this enchantment enters, put X +1/+1 counters on target creature, where X is that creature's power. At the beginning of your end step, draw two cards if you control the creature with the greatest power or tied for the greatest power.