Endless Horizons [Eventide] Tezzeret and that player can't activate

and that player can't activate abilities that aren't mana abilities

{T}: Create a 2/2 black Vampire creature token with flying

Set: Masters 25 Type: Creature — Beast Rarity: Rare Cost: {5}{G}{G} When Protean Hulk dies

This noise is so loud it echoes through the trees and seems to come from all directions at once

Endless Horizons [Eventide] Tezzeret and that player can't activateSet: Eventide Type: Enchantment Rarity: Rare Cost: {3}{W} When Endless Horizons enters the battlefield, search your library for any number of Plains cards, exile them, then shuffle. At the beginning of your upkeep, you may put a card you own exiled with Endless Horizons into your hand.