If the target creature is an illegal target as Faller's Faithful's ability tries to resolve, it won't resolve and none of its effects will happen

0002_MTGTLA_BBTheme: Aang Tutorial Theme Card 8 Plains Aardvark Sloth Razor Rings Path to Redemption Appa, Aang's Companion Sledding Otter-Penguin Aang, Air Nomad Katara, Heroic Healer Momo, Rambunctious Rascal Aang's Defense Sokka, Wolf Coves Protector Tundra Wall Wolf Cove Villager 0008_MTGTLA_BBTheme: Zuko Tutorial Theme Card Dragon Moose Explosive Shot Run Amok Fire Nation's Conquest Komodo Rhino Zuko, Avatar Hunter Zhao, the Seething Flame Iroh, Firebending Instructor Zuko's Offense Fire Nation Soldier 8 Mountain Capital Guard Warship Scout 0001_MTGTLA_BBTheme: Allies Theme Card Kyoshi Warrior Guard Jeong Jeongs Deserters Glider Kids Avatar Enthusiasts Allied Teamwork Aang, the Last Airbender Suki, Kyoshi Warrior Rabaroo Troop Master Piandao Mechanical Glider Path to Redemption Airbending Lesson Thriving Heath 7 Plains 0004_MTGTLA_BBTheme: Waterbending Theme Card Flying Dolphin-Fish Otter-Penguin Katara, Bending Prodigy Sokka, Lateral Strategist Cat-Owl Flexible Waterbender Giant Koi The Terror of Serpent's Pass Watery Grasp Bender's Waterskin Deny Entry Waterbending Lesson Thriving Isle 7 Island 0003_MTGTLA_BBTheme: Spells Theme Card First-Time Flyer Master Pakku Rowdy Snowballers Iguana Parrot Turtle-Seals Geyser Leaper Serpent of the Pass Barrels of Blasting Jelly Abandon Attachments It'll Quench Ya

As it keeps getting better and more present, like with this card, I keep wondering how Ill protect my own graveyard strategies
You ramp Yidris out early, ensure he connects with an opponent, and then unleash a torrent of spells, each cascading into another free spell from your library
Being able to replace every land you play with a new card is a very powerful effect, and there are lots of good cards to pair it with
Decks playing Delver of Secrets are at the top of the heap between RUG Delver and U/R Delver, so much so that the vast majority of the Top 8 of this event was Delver variants