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Wall of Wonder Rarity: Rare TYPE: Creature SUBTYPE: Wall CMC: 4 Mana cost: USD: $2.34 EUR: 2.13 TIX: 0.00 EDHREC RANK: 28865 (1/5) Defender (This creature can't attack.) : This creature gets +4/-4 until end of turn and can attack this turn as though it didn't have defender

It turns out that when you have library manipulation and other high CMC cards in your deck the EtB trigger on this is pretty scary

Items are often single use effects that aid your Pokmon or your gameplay

It usually acts as both a Bitterblossom and a Viscera Seer, all be it with a mana cost

As a deckbuilding move, this makes total sense