So far in 2020, we've been averaging about one per month (and if you go back to the initial release in December, we've actually had 13 individual drops in three months, making the average closer to four drops per month since the series was announced), although the average is somewhat complicated by how you count themes that come with multiple drops, like the original Theros Gods during Worlds in February (technically, the Gods were five individual but related drops, although there is an argument for counting them as one big drop since buying all of the drops together was an option)
Corpse Knight is especially good in multiples and with token makers like History of Benalia or Adanto, the First Fort
Like most Magic: The Gathering cards, the value of Energy Tap depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Fourth Edition Foreign Black Border)
14 Showcase dossier mythic rares with invisible ink (8.4%) Invisible ink cards can only be found in Collector Boosters
During the defense I can mill my opponent's deck using Breaking , Maddening Cacophony , Glimpse the Unthinkable and mostly with Mind Funeral
