If you only have 1 union attack, you can also use MAGICAL STONE EXCAVATION to get union attack from your graveyard. But make sure you have atleast 2 extra cards in your hand by your last turn!!!
Depends, spell reclamation is a trap card so if youre really unlucky and its the last card you draw then youre screwed lol, whereas magical stone excavation(MSE) is a spell card so it doesnt really matter if you draw it first or last. But of course with MSE you have to discard 2 cards so theres that... lol
depends if you have 2 extra cards in the hand for MSE however Spell Reclaimation is only good only if you set it before your last turn. MSE can be used on the last turn but only if you have picked one up by a duel against Marik or as a points reward. Costwise, SR is the best choice.