Cadaverous KnightHow it works & interactions with other cards

Understanding Flanking and Regeneration

Cadaverous Knight has two distinct abilities. Flanking is a triggered ability that triggers whenever a creature without flanking is declared as a blocker for it. The second ability is an activated ability: for {1}{B}{B}, you create a 'regeneration shield.' If Cadaverous Knight would be destroyed this turn, it instead taps, is removed from combat, and all damage is marked off it.

Step-by-Step Resolution

When you attack with Cadaverous Knight and your opponent blocks with a creature lacking flanking, the flanking ability triggers and goes on the stack immediately. This resolve before combat damage is dealt, meaning the -1/-1 penalty could potentially kill a small blocker before it even gets to strike back. If the Knight is threatened by lethal damage or a 'destroy' effect, you must activate the regeneration ability before the destruction occurs to ensure its survival.

Common Mistakes to Avoid

A frequent error is trying to regenerate after a creature has already been put into the graveyard; you must activate the ability while the Knight is still on the battlefield. Additionally, note that Flanking only triggers when Cadaverous Knight is blocked, not when it acts as a blocker itself. Finally, remember that regeneration only protects against destruction (lethal damage or 'destroy' effects), not against being sacrificed or having 0 toughness.

Strategic Implementation

You should play Cadaverous Knight when you expect a grindy game where creature combat matters. Keep three mana open (two of which must be black) whenever you anticipate a board wipe or a dangerous block. Its typing as a Zombie and a Knight makes it highly compatible with tribal synergies that can further boost its effectiveness.

Interaction examples

Weakening the Golem

Solemn Simulacrum

If you attack with Cadaverous Knight and your opponent blocks with Solemn Simulacrum, the Flanking ability triggers because the Golem does not have Flanking. The Solemn Simulacrum becomes a 1/1 until end of turn. When combat damage is dealt, both creatures would normally die, but you can pay {1}{B}{B} to regenerate your Knight, keeping it on the board while the Golem is destroyed.

Double Flanking Triggers

Roaming Throne

If you control Roaming Throne and have chosen 'Knight' as its type, Cadaverous Knight's Flanking ability will trigger an additional time whenever it is blocked by a creature without Flanking. This means the blocking creature would receive -2/-2 instead of -1/-1, effectively neutralizing even tougher defenders before damage is exchanged.