You don't want cards for ; "Late Game" . You want cards that will potentially catch your opposing player off-guard, like counters to their decks. For example; They're playing a zombie/re-animate deck, and you have; Grafdigger's Cage, it will shut down there re-animating in there graveyard, so therefor; they won't be able to bring there Zombies back from the dead.
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I would use thunderbolt for burn, not searing spear.
Hmm, this looks familiar? :p