mtg untap symbol cards Rules Text: Untap, Subtype: Equipment, 23 Untapped in MTG: Rules, History,

That includes lands you sacrifice, cycle, mill, and so forth

If a creature dying at the same time that another permanent you control leaves the battlefield causes a triggered ability of that permanent to trigger, that ability triggers an additional time

It flies and as a rough to answer protection

To double the number of a kind of counters on a permanent, put a number of that kind of counters on it equal to the number it already has

Magic walks a tightrope

While Tergrid, God of Fright wasn't powerful enough for Eldraine -infused Standard, I think it might be once we get rotation (depending on how busted Innistrad: Midnight Hunt ends up being)