In most cases (see below), if you wait until the combat damage step or end of combat step, it will be after combat damage has been dealt, so the Ninja won't deal combat damage
Depending on the supply of Assassins Creed, this new reprint could bring prices down across the board
If someone did manage to use this method to make a die that's both significantly weighted while still looking indistinguishable from a regular one I wouldn't be that surprised, but I don't think it'll be trivial to get it right
Scapeshift can be a great way to get a lot of landfall triggers in a single turn and can trigger other abilities focused on lands leaving the battlefield
This interaction alone is probably lights out for the Witch, but maybe we can make her work with enough sacrifice outlets
This isnt to say that emerald is weak, or doesnt have good cards