Targeting problems in weekly builds
Problem 1: [[Atraxa, Grand Unifier]] is allowing players to select all ten revealed cards, rather than one of each type. Problem 2: [[Chandra's Incinerator]] is triggering but not allowing you to select a target and resolve the effect.
Atraxa, Grand Unifier - (Gatherer) (Scryfall) (EDHREC)
{3}{G}{W}{U}{B} Legendary Creature — Phyrexian Angel 7/7 Flying, vigilance, deathtouch, lifelink When Atraxa enters, reveal the top ten cards of your library. For each card type, you may put a card of that type from among the revealed cards into your hand. Put the rest on the bottom of your library in a random order. (Artifact, battle, creature, enchantment, instant, land, planeswalker, and sorcery are card types.)
Chandra's Incinerator - (Gatherer) (Scryfall) (EDHREC)
{5}{R} Creature — Elemental 6/6 This spell costs {X} less to cast, where X is the total amount of noncombat damage dealt to your opponents this turn. Trample Whenever a source you control deals noncombat damage to an opponent, this creature deals that much damage to target creature or planeswalker that player controls.
Not sure if these are all the same problem but ripple cards' trigger, Pilfer, and Traumatic Revelation all wouldn't allow selection of cards revealed.