The Ward will deter opponents from interacting with Captain America initially, but there are enough ways for good players to avoid panicking just because a creature has a Ward
Control decks want to play very few actual win conditions in their deckand having them be indestructible means you have to worry far less about them dying to a stray Abrade and making your ability to turn the corner and push toward winning that much harder
If The Destined White Mage has at least one +1/+1 counter on itself, and with Triskelion exiled by Agatha's Soul Cauldron, you can activate Triskelion's ability on The Destined White Mage and remove one +1/+1 counter from itself to deal 1 damage to any target
Naturally, Games Workshop wasn't gonna let Wizards play with its toys unless they laid down the lore first, and Warhammer Community assures the crossover "involved substantial input from the Warhammer 40,000 design studio, ensuring every last detail matched the Warhammer hobby you know and love
Decks that play their opponents' cards are great for adjusting to the power level of a table because you really are at the mercy of what your opponents bring
Delirium If there are four or more card types among cards in your graveyard, instead search your library for any card, put it into your hand, then shuffle