Venusaur, the final evolution of the starter Pokmon Bulbasaur, may not be as big a name as Charizard or Pikachu, but can hold its own for value and is a favorite Pokmon choice for many players
Bilbo's Ring Celestial Armor Champion's Helm Cryptothrall Crystal Barricade Crystalline Giant Doors of Durin Dragonfire Blade Eater of Virtue Essence of Antiquity Giant's Amulet Glaring Spotlight Illvoi Light Jammer Inspirit, Flagship Vessel Jade Orb of Dragonkind Mask of Avacyn Mirror Shield Orbs of Warding Ring of Evos Isle Scion of Draco Shadowspear Shadowspear Simic Keyrune Skrelv, Defector Mite Soundwave, Superior Captain Sphinx of the Guildpact Survey Mechan Swiftfoot Boots Syr Ginger, the Meal Ender The Fire Nation Drill Walking Skyscraper Witchbane Orb
Sacrifice a creature whose value has already been used up, like Arboreal Grazer, Burning-Tree Emissary or Reclamation Sage
To return to the example of the black deck against the red deck, you might go through your main deck and decide that you can afford to trim one expensive card and two Read the Bones (leaving two to maintain your strength in the late game)