You can literally dredge large numbers of cards into your graveyard every turn for zero mana but even if you dont want to tap out resources each turn filling your yard, the threat of doing it at instant speed should have every potential attacker thinking twice before tangling with the Wreath
You either spend a small fortune, or you open youre usual one or two packs
Having to pay a mana and discard to peel off a card for only that turn is a weakness, though, especially if more expensive spells are on the menu
*Buy Ozolith, the Shattered Spire and Marauding Mutagen cards on eBay or Amazon
Yes, youre down a land, but youre likely denying your opponent a way stronger land than the basic you just used to pay for this spell
Battle for Baldurs Gate all-star Displacer Kitten rounds this out to enable entering the Battlefield combos