I’ve been playing around with different Sling decks and this is the one that took me from Diamond 3 to Masters. I was struggling with the 3 faction builds and slimmed it down to just red and blue.
Mirror Image really made more a difference than I thought it would initially.
If you can stall long enough to get
Savagery with the Spellcraft on
The Throne Room, it makes for a nice combo:
Sling of the Chi >
Rost, the Walking Glacier > apply Savagery > attack with Killer (or copy first). Also, if you can keep a Rost with Killer on him then hit him with a
Replication Cell, that can be pretty devastating.... all depends what you’re up against but you have several options for different combos.
Also tried using
Gelatinous Form. It works really well with Sling and Mirror Image if you can get the mana pool for it but I often failed to have enough to get it to work when I needed it, or it was just overkill once I already had the advantage and was most likely going to win anyway.
Larai, the Appraiser helped me a few times to get Sling and stopped a few relics from being used. Overall not super helpful but it was nice at times.