Stironic Resonator and Spellweaver Helix
You will get to copy the other three cards.
If you copy the Helix's enter the battlefield trigger, you'll exile four target sorcery cards. When you cast a spell with the same name as one of the exile cards, you may copy “the other”, which in case means “all other cards exiled by the first linked ability”. So if you cast a spell that triggers the Helix's ability, you'll be able to cast a copy of the other three cards.
Nathan Long
Wizards.Com Boards NetRep