Whether youre copying a ramp spell, a draw spell, a removal spell, or just taxing spells by two mana, this thing pays dividends
Offspring Perhaps the cutest mechanic in Magics history, offspring is an additional cost for creatures which gives you an additional copy of the creature if you pay the cost, except its a 1/1 child version of the creature
I am more excited about The Brothers War than any Standard-legal set in the last couple of years

Abandon Attachments Abzan Charm Aether Syphon Agency Coroner Aggressive Mining Alhammarret's Archive All-Seeing Arbiter Alms Collector Alpharael, Dreaming Acolyte Altar's Reap Aminatou, Veil Piercer Arcane Denial Arcane Endeavor Archmage Ascension Arm-Mounted Anchor Artificer's Epiphany Artistic Refusal Arwen's Gift Ashiok, Sculptor of Fears Atemsis, All-Seeing Aven Heartstabber Azorius Locket Azra Oddsmaker Bad Deal Bandit's Haul Bandit's Talent Bankrupt in Blood Bard, King of Dale Battle of Frost and Fire Battlewing Mystic Bazaar Trademage Bazaar of Baghdad Behold the Multiverse Behold the Unspeakable Beorn the Fierce Bequeathal Beza, the Bounding Spring Big Score Biomechan Engineer Birth of the Imperium Bitter Reunion Black Widow, Intel Expert Blighted Cataract Blitzball Blood Fountain Blood Scrivener Bold Biochemist Boros Locket Boseiju Reaches Skyward Brainstone Brainstorm Brainstorm Brainsurge Brilliant Spectrum Bringer of the Blue Dawn Brokers Charm Byway Barterer Cait, Cage Brawler Calamitous Tide Calim, Djinn Emperor Candlestick Careful Study Carnival Elephant Meteor Case of the Crimson Pulse Case the Joint Catalog Cathartic Pyre Cathartic Reunion Cavalier of Gales Cephalid Sage Ceta Sanctuary Champion of Wits

Brads #1: Knight of Grace / Knight of Malice ( Dominaria ) Hexproof: a great ability when used sparingly
As long-time MTG players will note, those element-bending abilities are brand new to Magic , with these adapting the magical abilities seen in Avatar: The Last Airbender