Certainly any deck that wants that sort of thing will make use of Razzy T here, especially since the cost reduction in the resurrection ability will be an easy hurdle to jump in most Commander games
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of The Water Crystal's first ability)

Adder-Staff Boggart Afterburner Expert Akki Avalanchers Akki Battle Squad Akki Blizzard-Herder Akki Coalflinger Akki Drillmaster Akki Ember-Keeper Akki Lavarunner Akki Raider Akki Rockspeaker Akki Ronin Akki Scrapchomper Akki Underling Akki Underminer Ankle Shanker Ardoz, Cobbler of War Arms Dealer Auntie Ool, Cursewretch Auntie's Snitch Battle Cry Goblin Battle Squadron Battle-Rattle Shaman Battle-Scarred Goblin Bazaar Trader Beetleback Chief Ben-Ben, Akki Hermit Bile-Vial Boggart Blackcleave Goblin Blisterstick Shaman Bloodcrazed Goblin Bloodmark Mentor Bloodshot Trainee Bloodstone Goblin Boartusk Liege Bog Hoodlums Boggart Arsonists Boggart Birth Rite Boggart Brute Boggart Cursecrafter Boggart Forager Boggart Harbinger Boggart Loggers Boggart Mischief Boggart Mob Boggart Prankster Boggart Ram-Gang Boggart Shenanigans Boggart Sprite-Chaser Boggart Trawler Boltbender Boneclub Berserker Boom Scholar Boomstacker Boros Recruit Brash Taunter Breeches, Brazen Plunderer Breeches, Eager Pillager Breeches, the Blastmaker Broadside Bombardiers Burnout Bashtronaut Cacophony Scamp Cam and Farrik, Havoc Duo Caterwauling Boggart Champion of the Weird Chaos Spewer Chasm Guide Cheering Fanatic Chimney Rabble Clamor Shaman Conduit Goblin Conspicuous Snoop

And Ink-Eyes, Servant of Oni, the legendary Rat Ninja that favors graveyard recursion , is thus one of the most important creatures of the type ever printed