Vigilance (Attacking doesn't cause this creature to tap.)

When Dogged Detective enters the battlefield, surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

Whenever an opponent draws their second card each turn, you may return Dogged Detective from your graveyard to your hand.

At the beginning of your end step, each opponent loses 1 life and you gain 1 life.

Whenever you crank Dogsnail Engine, target player gains life equal to the greatest power among creatures you control.

, : Choose a permanent you control. Prevent all combat damage target creature would deal this turn if it shares a color with that permanent.

At the beginning of your end step, if Mad Dog didn't attack or come under your control this turn, sacrifice it.

Whenever Mortis Dogs attacks, it gets +2/+0 until end of turn.

When Mortis Dogs dies, target player loses life equal to its power.

When Plague Dogs dies, all creatures get -1/-1 until end of turn.

, Sacrifice Plague Dogs: Draw a card.

Defender

, Sacrifice Resolute Watchdog: Target creature you control gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Blitz—, Pay 2 life. (If you cast this spell for its blitz cost, it gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step.)

You may cast Tenacious Underdog from your graveyard using its blitz ability.

Watchdog blocks each combat if able.

As long as Watchdog is untapped, all creatures attacking you get -1/-0.

Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.)