The first is an upkeep trigger that trades two life for exiling the top card of a library and then casting while it's exiled
Kraum lets you generate value as your opponents play cards since he lets you draw a card when your opponents cast their second spell each turn
You can put together in-color graveyard payoffs like Archfiend of Sorrows, Tizerus Charger, Lucid Dreams and Young Necromancer, and theres enough overlap with the delirium and madness cards to just throw in things like Raving Visionary and Mystic Redaction
It's the sort of card value that gives you card quality over time
If posion-proliferate control decks become a thing, as players have been discussing as a possible option, this will be a lynchpin in that archetype
The playmat featuring Winnie the Pooh characters is also featured in the announcement, though it is unclear how guests can acquire it