If their strength is lower than their willpower, they take damage and damage counters equal to the strength value are placed on the card
Ashnods Altar is a three mana Artifact that allows you to sacrifice a creature to gain two colorless mana
We wanted to mention this because you can use turn-ending effects during the cleanup step in these circumstances, but this doesnt allow you to prevent effects that last until the end of turn from ending
Perplexing Test will bounce Halsin to your hand, so make sure you've used his ability as much as you need to before casting the board wipe
Liliana planeswalkers cover a range of abilities, but they often care about making players discard or sacrifice cards, which aligns with blacks general themes, and zombies, which relates specifically to Lilianas prowess as a necromancer
N Everyones favourite villain/anti-hero N also makes for a great Pokmon card