Combos Utilizing Sigil-of-Sleep

Attack with the Specter, or use a Hermetic Studied one. The Sigil returns a creature to their hand. The Specter then forces them to randomly discard a card.(Feeling lucky?)

you send all their stuff back to their hand

tap every turn to return a creatue they have back to hand.

put embrace and sigil on golem and now u can hit ur opponent every turn and put back one of those nasty lil creatures into his/her hand. good idea to put on one cant be target spells or abilities ench

Enchant the Rootwater hunter with the Sigil, and damage your opponent with it. He cant stopp it with his creatures.

just enchant the prodigal sorcerer with sigil of sleep and curiosity and tap it

Seer turn after turn blasts away at opponent also returning creatures back to his hand

As long at the elite is enchanted, it is unblockable, and whenever it does damage, that player must return a creature to his hand

you put sigil on your sniper and at the begening of your upkeep have your sniper do damage and your opponent bring up 1 of his/her creatures

cheap trick to return creatures to their owners hand