These are called Don!! cards, named after the onomatopoeia used frequently in the original manga to indicate action or excitement
Having skulk with a low attack makes it basically unblockable while having deathtouch with a high toughness can make for an amazing blocker
Her ultimate is Ancestral Recall + Omniscience and just so happens to be immediately useable if you have Doubling Season out, and she even survives afterwards too because why not
You get a standard Hydra (, enters with X counters) with three keywords which matter a great deal - protection in the form of Vigilance, evasion in the form of Trample, and surprise from Haste
Suspend 2 (Rather than cast this card from your hand, you may pay and exile it with two time counters on it
Bojuka Bog is another option in black, though it generally lacks the ability to exile at instant speed, and it only hits one player