The work of noted MTG mathematician Frank Karsten on mana base requirements, widely referenced in the competitive community, is grounded in hypergeometric probability
Common) Artemis, the Magistus Moon Maiden (Common) Source: V Jump
Cards like Mystical Tutor , Personal Tutor , Enlightened Tutor , Idyllic Tutor , Sylvan Tutor , and Worldly Tutor
If the number of equipped creatures you control changes after that time, it won't change the bonus granted
Perhaps not good enough as a scry commander, but Arwen is a solid role player, even if you never activate that 6-mana ability
Otherwise, you may turn a permanent you control face up . Manifesting dread allows players to look at the top two cards of their library manifest one as a face-down 2/2 creature and put the other in their graveyard