As such, I believe the more appropriate home for Senu is in Commander where it can be utilized multiple times
See why the enchantment was added
If you run Temur Sabertooth as a way to bounce Nikya to your hand, you could find yourself dropping an Eldrazi Titan on the back of a big Electrodominance or just bringing the table to its knees with an old fashioned Comet Storm
Not only that, but this green creature also grows based on the number of creatures that were destroyed this way
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We have ramp, lifegain, draw, discard, creature and planeswalkers removal that you can scale, and an ultimate that is fairly quickly reached