Stack Master

Does trample interact differently with deathtouch than with a regular creature? If I attack with a creature like [[Grizzly Bears]] and my opponent blocks it, but I use a removal spell to kill the blocker before the combat damage step, does my creature deal damage to the opponent? If I have two copies of [[Spelunking]] on the battlefield, can I tap a land for mana in between the two effects to get extra mana? If I have [[Altar of the Pantheon]] and my opponent uses [[Oko, Thief of Crowns]] to turn it into a 3/3 Elk creature with no abilities, does it still increase my devotion to each color by one? If my [[Enduring Innocence]] dies and its ability triggers to return it to the battlefield as a non-creature enchantment, how does this interact with an opponent's [[Containment Priest]]?