leyline mtg cards of Lightning - 45 - WOT - NM If Leyline of Anticipation is in your opening hand Leyline of the Void (MB2)

The 1 mana rebate from Ur-Dragon makes this a considerably more worthwhile card to consider, as a 6 mana 4/4 haste, and adding the additional mana is good ramp for a deck with many expense cards in it (big surprise there)

At the beginning of your end step, if a creature or planeswalker an opponent controlled was dealt excess damage this turn, create a 4/4 red Dragon creature token with flying

In a rotisserie style of event with lots of sideboard slots available you might consider a learn card and a couple of lessons but even then I doubt it

I've never understood why anyone would sell sleeves in packages of 50, meaning you need to buy two packages to sleeve one 75-card constructed deck