Heliod, Sun-Crowned Heliod, Sun-Crowned is one of the best life gain payoff cards in MTG , but let's be honest: a huge part of that reputation comes from one very silly interaction: Heliod, Sun-Crowned + Walking Ballista
Between Psychatog, blue-green madness decks, Quiet Speculation, and a host of other discarding/bring directly to graveyard effects, the Analysis has quietly become the powerhouse card drawing card of the current Standard environment
With a cheaper curve, Arcane Proxy will fit seamlessly in the control gameplan of Standard
This tells me that some combination of the following things must be true: 1
Summons are an interesting innovation for creatures, and the rest of the set mechanics do a good job of oozing what Final Fantasy is
(Some sets only have one, some even have zero!)