Yawgmoth, Thran Physician FINAL FANTASY: Through the Ages, Mythic Limited: 4.5 The Emperor, Hell Tyrant (Yawgmoth, Thran Physician) asks if you have a lot of creatures in your deck, and in exchange, it delivers you plenty of match wins
Five-Color Bring to Light (2 players): Bring to Light can find Scapeshift, which can win the game with seven or eight lands, or Valki, God of Lies, which can be cast as Tibalt, Cosmic Impostor for free
BT3-054 C Digimon Lv.5 Alternative Art Blossomon Color Green Cost 7 DP 7000 Digivolve Cost 1 Green 3 from Lv.4 Form Ultimate Attribute Data Type Vegetation Card Text 1 [Effect] Digisorption -3 (When one of your Digimon digivolves into this card from your hand, you may suspend 1 of your Digimon to reduce the memory cost of the digivolution by 3.) BT3-061 C Digimon Lv.3 Alternative Art Chuumon Color Black Cost 3 DP 1000 Digivolve Cost 1 Black 0 from Lv.2 Form Rookie Attribute Virus Type Beast Card Text 1 [Effect] [All Turns] Your opponent can't gain memory except with Tamer effects
So yes, you may be sacrificing some efficiency