For example, if you're instructed to draw two cards and you replace the first draw with a dredge ability, another card with a dredge ability (including one that was put into your graveyard by the first dredge ability) may be used to replace the second draw

Atalya, Samite Master Colleen Wing, Street Samurai Cyan, Vengeful Samurai Deadly Poison Sampler Doc Samson, Super Psychiatrist Flotsam // Jetsam Flotsam // Jetsam Gossamer Chains Gossamer Phantasm Indebted Samurai Isamaru, Hound of Konda Leonardo, Sewer Samurai Mothrider Samurai Orim, Samite Healer Oriss, Samite Guardian Peerless Samurai Sam's Desperate Rescue Sam, Loyal Attendant Sami's Curiosity Sami, Ship's Engineer Sami, Wildcat Captain Samite Alchemist Samite Archer Samite Blessing Samite Censer-Bearer Samite Elder Samite Healer Samite Herbalist Samite Ministration Samite Pilgrim Samite Sanctuary Sample Collector Samurai Enforcers Samurai of the Pale Curtain Samurai's Katana Samut's Sprint Samut, Tyrant Smasher Samut, Vizier of Naktamun Samut, Voice of Dissent Samut, the Driving Force Samut, the Tested Samwise Gamgee Samwise the Stouthearted Selfless Samurai Silverstorm Samurai Sky-Blessed Samurai Sunblade Samurai Takeno, Samurai General The Falcon, Sam Wilson The Masamune Wetland Sambar

If you're a fan of Magic and the worlds of Fallout, LOTR, Doctor Who, or any other editions, don't forget to take a look at the rest of the Deckboxes
That's a mouthful, so I'll break it down
They just prevent damage, which, like gaining life, is rarely worth spending a card on
It's hard to cast outside of mono-White, but on the battlefield it's better than Cho-Manno, Revolutionary