It doesn't matter whether you're playing gold Dragons, Shrines, Planeswalkers, Legends, or soup, Leyline is a Chromatic LanternChromatic Lantern that will spot you its mana cost some amount of the time
Heroics are a special summoned focused deck that revolves around their main deck Heroic Challengers, resembling fighters and weapons of old, and extra deck Heroic Champions, resembling legendary fighters as well as weapons from legend
Charcadet can be obtained from Promotions in the PROMO-B set
BT10-024 SR Digimon Lv.5 Alternative Art MetalGreymon Color Blue Cost 7 DP 8000 Digivolve Cost 1 Blue 4 from Lv.4 Form Ultimate Attribute Virus Type Cyborg/Blue Flare Card Text 1 [Effect] Material Save 2 (When this Digimon would be deleted, you may place 2 cards in this Digimon's DigiXros requirements from this Digimon's digivolution cards under 1 of your Tamers.) [On Play] This Digimon gains Rush for the turn
What makes Monastery Mentor so powerful in these older formats is the insane density of stellar zero and one-mana spells which allow you to trigger it early and often
Altogether, this card straddles the line between competitive tech and collector gem
