This maximizes life gain while keeping attackers resilient
Whats cool about this combo is that it can be found off of Collected Company on your opponents end step, meaning your opponent has to play scared once you have four mana, even if your board is empty
Thoden, King of Rohan Thoden, King of Rohans ability to give creatures double strike for a turn can make your attackers a lot more dangerous
Even better, Karametra, God of Harvests can be a big, indestructible 6/7 creature that survives most removal, perfect for setting up Traverse, and often runs cards that love big land ramp, like Avenger of Zendikar
Inkwell Leviathan 8 This is the other Simic Sky Swallower and is a big part of why we see less of the big fish in cheat in focused decks (that is one of the nice things about Sky Swallower in the cube in general, it is something you can just play at the top end of a normal deck and it gets about half of its play in that manner)
If an opponent plays a spell to destroy your cards, now it destroys everything it could possibly target