63x88mm card sleeves Dragon Shield - Dual Matte Keep your cards free of the wear and tear of battle Standard Size Card Sleeves (63x88mm)

Whenever Sephiroth enters or attacks, you may sacrifice another creature

Welcome to today's edition of the Daily Dose of Oath of the Gatewatch

There will be superheroes, villains, equipment, and epic abilities brand new to Magic

My best guess was that seven is one of the more common numbers for card games where you draw cards and perhaps it won out because it was what Richard Garfield thought people would assume to draw

Saying that, needing four cards is a bit of a stretch, even with Formidable Speaker providing redundancy

Maybe hybrid mana causes problems in rules text, and they didn't want to make adjustments for a single digital-only card