Gravecrawler can be recast from the graveyard, provided you control a Zombie
If you cast Jeskai Baller from your hand and the spell resolves, you must exile the spell due to its rebound ability
(Note that if the defending player had only one bear, he could not block the sliver regardless of the provoke because the Two-Headed Sliver is imposing a restriction on blocking, and a restriction always trumps a requirement.) In cases where there are several possible declarations that would obey the same amount of requirements, the defending player can choose between them
Azula, Cunning Usurper Azula, Cunning Usurper provides exceptional removal since it also draws cardsspecifically, whatever cards you exile
"For example, this card here is based off a classic pixel-art game, and it's probably the first time in history where that pixel art has been reimagined as 3D fantasy art, so the card plays to people's nostalgia and their imaginations