On rare occasions, Konami will create a Link 1 monster that actually follows basic balance principles, and Gravity Controller is the best example of this concept
1: Trynn, Champion of Freedom & Silvar, Devourer of the Free - Ikoria, Lair of Behemoths These two partners from the Ruthless Regiment deck in Commander 2020 were secretly a powerhouse that everyone forgot about
The idea was of course that while neither side would really be playable on it's own, being able to decide in game whether you wanted a land or spell was well worth the slight downgrade on rate
Im not 100% sold on Soul Diviner, since there arent too many good counters to plunder outside of planeswalkers and loyalty seems way too valuable to cash in for cards
Fusion and Synchro: Special Summon 1 "Outer Entity" Xyz Monster from your Extra Deck, and if you do, attach this card to it as material