Maui synergizes well with Maid Marian because she allows him to banish anything with three or less strength and survive to fight again
Overrun is one of the defining green cards, a little like Death Cloud for black in that you set it up and effectively end the game with it, it is what you get as reach in green creature decks and does very well at ending games promptly
Whenever Stitchers Graft becomes unattached from a permanent, sacrifice that permanent
How much does Cloud, Planet's Champion cost
Yes, a few cards give defender to creatures
Put simply, these sorts of two-for-ones are single, individual pieces of cardboard that either trade for multiple (i.e., "two") opposing cards, or deal with an opposing card while leaving a little something behind