Flying, haste

Dragon spells you cast cost {1} less to cast.

Whenever you cast a Dragon spell, Sardior, the Ruby Dragon deals 1 damage to each opponent and you draw a card.

{W}{U}{B}{R}{G}: Search your library for a Dragon and put it in your hand, then shuffle.

If Sardior would leave the battlefield, exile it and return it to the battlefield transformed.

Flying, trample, haste

Dragon spells you cast cost {1} less to cast.

Other Dragons you control have +2/+2

Whenever the Ur-Dragon, Essence of Ruby attacks, create a 0/5 Dragon Egg creature token that's all colours and has defender and "{W}{U}{B}{R}{G}, Sacrifice this creature: Search your library for a Dragon and put it in your hand, then shuffle."