The strategy revolves around Go-shintai.
Initially with the entry in which you create a shrine token, every time you enter a shrine, etc. It has the ability to
refresh any enchantment by paying one of each color.
Sisay would be a possibility. But the strategy does not revolve around it, it is more a creature with which to search for legendary permanents, in this case more shrines.
And yes, it costs a colorless less to get Sisay out. Despite this, being a deck that is based on the colors white and green, you do not have ramp problems.
I hope I was able to answer your question or clarify your doubts.
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