Related Tying Crucible of Worlds into the G.E.C.K is a particularly clever alt-art choice, and this card is sure to be a favourite among Fallout die-hards as a result
It'll be interesting to see just how many cards feature it in ECL, especially given that wither and new mechanic blight also play around with -1/-1 counters
A deck that heavily relies on Tribute, Fusion, Synchro, Xyz, or Link Summons would benefit from using Spellbound in order to disrupt the opponent's strategy and prevent them from using their monsters as materials
Without the Trap Support he is not all that hard to get rid off with a decent hand even though he still can cause some problems
Arguably the best card draw effect that white has access to, Esper Sentinel does have the limitation of its white color identity and thus lacks the flexibility of colorless artifacts that fit into any deck but as long as your commander doesn't hate Plains, you can't go wrong with this studious Sentinel
It depends on if the Ring tempting mechanic is good enough to generate value