Excluding reprints, thats 162 brand new legends added to the format
Rex, Cyber-Hound Rex, Cyber-Hound is a cool little combo enabler hiding in the Fallout Science
Let's assume you have a Circle of Protection from red magic, and you are attacked by a Goblin, which is a red creature
Next up is Izzet Splinter Twin, from 2011: Splinter Twin | Standard | Mike Flores, 2011 TCGPlayer.com WWS Big Apple/1st Creatures (11) 1 Pilgrim's Eye 2 Inferno Titan 4 Deceiver Exarch 4 Sea Gate Oracle Planeswalkers (6) 2 Jace Beleren 4 Jace, the Mind Sculptor Instants (9) 2 Spell Pierce 3 Mana Leak 4 Into the Roil Sorceries (4) 4 Preordain Enchantments (4) 4 Splinter Twin Lands (26) 10 Island 8 Mountain 4 Scalding Tarn 4 Tectonic Edge Sideboard (15) 1 Basilisk Collar 1 Consecrated Sphinx 1 Dispel 1 Elixir of Immortality 1 Jace Beleren 1 Jace's Ingenuity 2 Manic Vandal 2 Pyroclasm 2 Spell Pierce 2 Spellskite 1 Trinket Mage Splinter Twin is sort of a hybrid Midrange/Combo deck
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What's tricky is how it works with other draw replacements like Dredge or Abundance where you don't actually draw the card, and yet Library asks you to 'put the card on top' - which actually works to the advantage of the dredge player, as they won't have to put anything back or pay the life if they dredged thrice - as no extra cards was technically drawn