Germination Practicum This is the midrange Ouroboroid
It can't be removed by artifact sweepers, which we see is totally cool and fine with The One Ring, and worst case it represents inevitability on top of untapped mana ramp at 2, the best one could ask for
Any one of your late-game threats can turn the tide of a match if left unanswered , which is something you can (and sometimes will) heavily rely on
Some cards allow you to get extra combats without paying mana, while others make it easy to activate Najeela, the Blade-Blossoms ability
Basically, it's baby's first Proliferate (a keyword the design team opted to keep out of the Kaladesh MTG set at the time)
I imagine cards with hexproof and indestructible counters are invaluable for this strategy