This interaction can be seen in Constructed with cards like Walking Ballista and Vault of the Archangel or Basilisk Collar that grant deathtouch
Protection from instants means that Emrakul cant be the target of instant spells or activated or triggered abilities from instant cards, and damage that would be dealt to it by instant spells or cards is prevented
Consul's Shieldguard: Borderline limited jank and constructed useful
Temmet, Naktamun's Will $12.21 Temmet, Naktamun's Will is another precon foil, and therefore the price you see is the precon price
Each of these will trigger landfall effects individually, so if you hit three lands, that's three landfall triggers
Its a passable card to play in enchantress decks as a part of an Omniscience combo, but that's too difficult to pull off