TL;DR: If someone tries to draw extra cards, they either end up discarding and drawing, or milling instead, so they never actually go up on cards
Once the Spacecraft has a number of charge counters on it equal to or greater than the number indicated in the circle on the left side of its text box, it becomes a creature with the power and toughness indicated on the right side
The strategy takes some work and can be disrupted, but the card advantage is tantalizing
HAT's poor Geargia matchup became less relevant with LS Ruler weakening Geargia's hold on the format, and with cards like the Artifacts and Hands, HAT could effectively hamstring Lightsworn's huge plays and grind the Lightsworn deck out
You can only use each effect of "Dark Spirit's Mastery" once per turn
Mishra, Eminent One has no cost reductions, no lord ability, and only has a single ability