Your creatures fly, it has lots of respones, it gets to play a lot of spells during not your own turn and its more combat-control in playstyle than it initially appears to be
The 8 number by the card ID shows its from set 8, but as with all pre-release cards, it wont be legal to play until set 8 fully releases
Even when booster boxes do become available, Bundles remain a strong side play for diversification
Pelakka Wurm Rarity: Uncommon TYPE: Creature SUBTYPE: Wurm CMC: 7 Mana cost: USD: $0.14 EUR: 0.12 TIX: 0.02 EDHREC RANK: 8910 (7/7) Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) When this creature enters, you gain 7 life
You could alternate between sacrificing him as a counterspell, and sacrificing for damage and control
Speaking of #6 Zephyr Spirit (Ravnica) Why is it bad