I'll make it as concise and clear as possible on how to make the combo repeatable, though you should know that using any infinite combo might be grounds for a rule 0 discussion before your game
We get a decent attacker - 5/5 First Strike - but it's the fact we get to double our damage output while halving anything we take that really makes it
With that being said, WotC has shown that theyre able to create some very unique designs with Sliver Gravemother and The First Sliver, so theres no need to lose hope
Foxglove Hes the one they call Mr
Think back to Ranger of Eos it found Soul Sisters, or Serra Ascendant, Mother of Runes maybe, or more recently, Esper Sentinel
Avatar Aang / Aang, Master of Elements The most intriguing part of Aang, Master of Elements is that the cost reduction actually affects generic costs, which cards like this almost never do