In most cases, the controller of the attacking creature will still become the monarch as it is likely their turn
The full texts of these abilities are "At the beginning of the monarch's end step, that player draws a card" and "Whenever a creature deals combat damage to the monarch, its controller becomes the monarch." If the triggered ability that causes the monarch to draw a card goes on the stack and a different player becomes the monarch before that ability resolves, the first player will still draw the card
Can you proliferate them to death
All keywords that together, create a versatile, aggressive threat
You can only cast three spells in the chapters the card gives you, counter shenanigans notwithstanding, so you dont need to hit something in every graveyard to get full value here
in the majority of TCGs, these are known as Secret Rare cards, due to their numbering