Introduced in the first Innistrad set, it's an unassuming, 1/1, indestructible doll unless you're particularly unlucky and it's suddenly able to kill anything it deals combat damage to
If you use its offspring ability, you'll get double the effect, but double the potential burn
Synchro summoning requires making sure the cards you are sacrificing for the summon match the level rating of the desired card (to summon a level 8 Synchro monster you would need to tribute two cards whose levels equal 8, for example), and one is labelled as a tuner card
Otherwise, you have plenty of room for playmats and your other accessories in this huge case
Shambling Remains Avatar of Discord Pyre Zombie Void Spike Jester Goblin Deathraiders Sarkhan the Mad Bituminous Blast Bladewing the Risen Blazing Specter Demigod of Revenge Igneous Pouncer Monstrous Carabid Torrent of Souls Wreaking Ball Wort, Boggart Auntie 10