If nothing like that happens, none of the players gets priority during the cleanup step, and the turn officially ends
For the cards available, you can also find foil versions of them, which are slightly harder to find
For the most accurate number, cross-reference at least two or three reliable sources to get a balanced view of the current market and avoid making a bad deal
Being able to play it as a creature board wipe in the late game when you don't need more lands is awesome, provided that you have a legendary artifact on hand to sacrifice
It requires understanding turns well
However, if a single creature you control with lifelink deals combat damage to multiple creatures, players, and/or planeswalkers at the same time (perhaps because it has trample or was blocked by more than one creature), the ability will trigger only once