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)

Mana Leak 12

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

An entire board of mana dorks can basically sew up the game on the following turn

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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