Isleback Spawn is a rare Creature — Kraken card from Shadowmoor (SHM), collector number 40. Current market price: $0.52 (foil $2.57), TCGplayer market prices via Scryfall.
Shroud (This creature can't be the target of spells or abilities.) This creature gets +4/+8 as long as a library has twenty or fewer cards in it.