【Hearth Tech#196】Sigil of Alacrity doesn’t work with Final Showdown?

the Dwarven District is not an on-play trigger Tamsin doesn’t work on Eye for an Eye Rat King’s deathrattle is different form Sherazin does Prestor’s Pyromancer work with Fire Secrets? Call can be degraded a spell is transformed into an Echo spell, Echo gives you the pre-transforming spell of Alacrity is not counted by Final Showdown sometimes