I am also running mono-Blue Sage of the Beyond to play into this as well
Every Magic: The Gathering set that comes out has some cards that are just flat-out better than other cards
The Ur-Dragon also has a game-ending effect once it hits the board, refilling your hand and slamming more dragons into play for free
Senu's last ability will trigger only if Senu is already exiled at the point immediately after blockers are declared and at least one legendary creature you control that attacked isn't blocked
This The Lord of the Rings: Tales of Middle-earth Commander Deck set includes 1 ready-to-play deck of 100 Magic cards (2 Traditional Foil Legendary Creature cards, 98 nonfoil cards), a 2-card Collector Booster Sample Pack (contains 1 Traditional Foil or nonfoil special treatment card of rarity Rare or higher and 1 Traditional Foil special treatment Common or Uncommon card), 1 foil-etched Display Commander (a thick cardstock copy of the commander card with foil etched into the cards border and art), 10 double-sided tokens, 1 Helper card, 1 deck box (can hold 100 sleeved cards), 1 Life Wheel, 1 strategy insert, and 1 reference card
Eight-and-a-Half-Tails Protection is one of the most broken mechanics in Magic