Every single time your Lightsworn monsters mill, Garoth will be milling and drawing cards for you too
Giant Cape's main goal is to avoid 1-hit knockouts, but you can add Potions instead
Still, the cost seems fair enough, and the defense counters do kind of feel adequate for Invasion of Kylem // Valor's Reach Tag Team

Abandon Attachments Abzan Charm Agency Coroner Aggressive Mining Alhammarret's Archive All-Seeing Arbiter Alms Collector Alpharael, Dreaming Acolyte Altar's Reap Arm-Mounted Anchor Artificer's Epiphany Artistic Refusal Arwen's Gift Atemsis, All-Seeing Azorius Locket Azra Oddsmaker Bad Deal Battle of Frost and Fire Battlewing Mystic Bazaar Trademage Bazaar of Baghdad Behold the Multiverse Behold the Unspeakable Bequeathal Big Score Biomechan Engineer Birth of the Imperium Bitter Reunion Black Widow, Intel Expert Blighted Cataract Blitzball Blood Scrivener Bold Biochemist Boros Locket Bringer of the Blue Dawn Brokers Charm Byway Barterer Calamitous Tide Careful Study Carnival Elephant Meteor Case of the Crimson Pulse Case the Joint Catalog Ceta Sanctuary Chart a Course Chemister's Insight Cipherbound Spirit Circle of Power Citanul Woodreaders Clandestine Work Clockwork Fox Cloudblazer Coastal Discovery Commence the Endgame Conch Horn Consecrated Sphinx Contact Other Plane Corrupted Conviction Costly Plunder Counsel of the Soratami Courier's Capsule Cruel Truths Crushing Disappointment Cult of Skaro Curator's Ward Damocles Base, Sword of Kang Dangerous Wager Daredevil Dragster Deadly Dispute Deadly Dispute Decode Transmissions Defacing Duskmage

But thats not a problem, because there are lots of ways you can build a Mardu deck that generates creature tokens and kills them, whether you focus on mobilize or not