Of the two, I prefer Crashing Drawbridge, but if you're in the need to pump up the damage just a bit, the equipment can be meaningful, though that extra mana matters, too
The idea wasn't used for Grixis, but it lasted long enough for other members of R&D, including Ken, to see it
This does come at a cost Japanese cards are generally more expensive than English cards on average, especially for special releases, simply because they are harder to get outside Japan
0/4 means you aren't going to remove it very easily very early with damage alone, meaning that it can just sit around and fade some damage while getting the effect off
A summon is a saga creature, so it works exactly like a saga: Once you reach the final chapter, and its triggered ability resolves, you have to sacrifice the saga
Pokemon Japan has already started posting cards from Mask of Change following the reveal of the set this morning