Arcane Barrier 1 (If you would be dealt arcane damage, you may pay {r} to prevent 1 of that damage.)
Spellvoid 1 (If you would be dealt arcane damage, you may destroy this to prevent 1 of that damage.)
When this defends together with an attack action card and a non-attack action card, the attacking hero discards a card and you draw a card.
Blade Break (When the combat chain closes, if this defended, destroy it.)
Legendary (You may only have 1 Sacred Art: Undercurrent Desires in a constructed deck.)
If you've played another blue card this turn, choose 3. Otherwise, choose 1;
Create a Fang Strike and Slither in your hand.
Banish up to 2 cards in an opposing hero's graveyard.
Transcend
Your attacks with stealth get "When this chain link resolves, banish all action cards defending this."
Instant -- {c}{c}{c}: Look at the top card of an opposing hero's deck. If it's blue, you may banish it. Until end of turn, you may play blue cards from that hero's banished zone without paying their {r} cost.
Arakni Specialization (You may only have this in your deck if your hero is Arakni.)
Look at the top 3 cards of the defending hero's deck. Put them back in any order, then banish the top card of their deck.
If you complete a contract this way, your Assassin attacks get go again this combat chain.