mtg deck search cards What spell make opponents library in Magic: The Gathering? then discard two cards Heart of the Explorer -

With firebending, this can become a powerful creature on its own, and it technically repays for 66% of its mana cost the turn it's played, as it costs 6 mana but generates 4 with firebending

Kitchen Imp Kolaghan Skirmisher Lamentation Liliana, Waker of the Dead Lokhust Heavy Destroyer Manor Skeleton Mardu Shadowspear Mardu Strike Leader Markov Crusader Masterful Ninja Mire's Malice Mirri the Cursed Mogis's Marauder Nether Shadow Nether Traitor Night Clubber Nihilith Olivia's Bloodsworn Ormendahl, Profane Prince Over My Dead Bodies

You have to be a bit careful with how you build when including this but there is no need to harm your plan to play her, she is still great even when you hit a Bird of Paradise

For three mana, you can tap them to return an Artifact or Enchantment from the graveyard to your hand

Artifacts - 12

Seems much closer to my budget