Gisa and Geralf Cecani are sibling necromancers on the plane of Innistrad
(If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous.) If Maester Seymour is no longer on the battlefield when its first ability resolves, use its power as it last existed on the battlefield to determine how many +1/+1 counters to put on the target creature
Interestingly, two quiet cards from the Time Spiral era were called out, but they're explained well: slow to start, but quick to take off if they pal around together
When you do, destroy target artifact or enchantment that player controls
If you're building a deck on a budget, I'd aim to grab two of the cheapest tutors available to you
18 Commander Legends: Battle for Baldurs Gate Set Boosters