Budget Alternatives to Kentaro, the Smiling Cat

Refraction Trap $0.03 3W · Trap If an opponent cast a red instant or sorcery spell this turn, you may pay {W} rather than pay thi... Pitfall Trap $0.04 2W · Trap If exactly one creature is attacking, you may pay {W} rather than pay this spell's mana cost. Arrow Volley Trap $0.11 3WW · Trap If four or more creatures are attacking, you may pay {1}{W} rather than pay this spell's mana cost. Runeforge Champion $0.16 2W · Dwarf Warrior When this creature enters, you may search your library and/or graveyard for a Rune card, reveal i... Ingenious Mastery $0.17 X2U · Sorcery You may pay {2}{U} rather than pay this spell's mana cost. Fervent Mastery $0.23 3RR · Sorcery You may pay {2}{R}{R} rather than pay this spell's mana cost. Devastating Mastery $0.25 2WWWW · Sorcery You may pay {2}{W}{W} rather than pay this spell's mana cost. Conspiracy Unraveler $0.26 5UU · Sphinx Detective Flying Leyline of Mutation $0.27 2GG · Enchantment If this card is in your opening hand, you may begin the game with it on the battlefield. Marshland Bloodcaster $0.27 4B · Vampire Warlock Flying Verdant Mastery $0.27 5G · Sorcery You may pay {3}{G} rather than pay this spell's mana cost. Nissa, Worldsoul Speaker $0.29 3G · Elf Druid Landfall — Whenever a land you control enters, you get {E}{E} . Summoning Trap $0.45 4GG · Trap If a creature spell you cast this turn was countered by a spell or ability an opponent controlled... Tlincalli Hunter // Retrieve Prey $1.03 5GG // 1G · Scorpion Scout // Sorcery — Adventure Trample Jodah, Archmage Eternal $1.10 1URW · Human Wizard Flying Rooftop Storm $1.37 5U · Enchantment You may pay {0} rather than pay the mana cost for Zombie creature spells you cast. As Foretold $1.65 2U · Enchantment At the beginning of your upkeep, put a time counter on this enchantment.