Cannot cast instants in ranked match. I had plenty of mana. It would summon the spell and tap the necessary mana but would not let me select a target creature, even though it was prompting me to. My opponent had nothing on the board that would prevent me from casting. It would even outline the available targets in blue (like usual) but I could not select any. My timer just kept running until I was eliminated. It wouldn’t even let me cancel the spell to play something different. It just froze until play passed to my opponent. I attempted banishing light and rebuke. Both had the same bug.