Ob Nixilis, the Fallen, is a five mana 3/3 Demon
You may be tempted to think a card like Ghostly Prison or Norn's Annex would work here, but they're not combat triggers (they like the "when" or "whenever" that defines something as a triggered ability), so just don't work all that well with Ishin
The characteristics of the half you didn't cast are ignored while the spell is on the stack
Its an interesting choice for the emblematic Quandrix spell: besides the characteristic low-poly design, this looks like it could be one of Prismari Colleges expressive masterpieces
The recurring value-oriented nature of Sun Titan targets lend themselves naturally to Restoration Angel-based strategies, such as Yuuya Watanabes U/W Control deck from Worlds 2015: Creatures (16) Lands (26) Spells (18) While Dragonlord Ojutai is sturdier, Sun Titan can be invaluable for going over the top of opponents, for actually ensuring hes got enough advantage to close it out
Bedlam Reveler also discards your (hopefully empty) hand to draw you three cards when it enters