Dark Tutelage
Enchantment
At the beginning of your upkeep, reveal the top card of your library and put that card into your hand. You lose life equal to its mana value.
"Ours is a path of the outcast, of pain given and pain received. But for the strong, it is a path that leads to power untethered from fae riddles." —*The Witch's Way*
イラスト：
Wilds of Eldraine: Enchanting Tales#28アンコモン英語適正
裁定
The converted mana cost of the revealed card is determined solely by the mana symbols printed in its upper right corner. The converted mana cost is the total amount of mana in that cost, regardless of color. For example, a card with mana cost 
has converted mana cost 5.
If the mana cost of the revealed card includes 
, X is considered to be 0.
If the revealed card has no mana symbols in its upper right corner (because it’s a land card, for example), its converted mana cost is 0.