Unhallowed Cathar can't block.

Whenever another creature you control dies, put a +1/+1 counter on Unruly Mob.

Equipped creature gets +0/+3 and can block an additional creature each combat.
Equip (: Attach to target creature you control. Equip only as a sorcery.)

At the beginning of your upkeep, you may put a charge counter on target artifact.

Extort (Whenever you cast a spell, you may pay . If you do, each opponent loses 1 life and you gain that much life.)
When Vizkopa Confessor enters the battlefield, pay any amount of life. Target opponent reveals that many cards from their hand. You choose one of them and exile it.

Flash (You may cast this spell any time you could cast an instant.)
When Voidmage Husher enters the battlefield, counter target activated ability. (Mana abilities can't be targeted.)
Whenever you cast a spell, you may return Voidmage Husher to its owner's hand.

Destroy target artifact.
Fuse (You may cast one or both halves of this card from your hand.)

Two target creatures you control each get +2/+2 and gain flying until end of turn.

Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

Sacrifice a land: You gain 2 life.