Menace
At the beginning of your end step, put a bounty counter on target creature an opponent controls. For as long as that creature has a bounty counter on it, it has "When this creature dies, each opponent draws a card and gains 2 life."

: Draw a card, then discard a card.
, , Sacrifice Obsessive Stitcher: Return target creature card from your graveyard to the battlefield.

Phantom Ninja can't be blocked.

You may play lands from your graveyard.

Buyback (You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)
Create a 1/1 white Soldier creature token.

Return target permanent you control to its owner's hand.

Enchant creature
Enchanted creature gets +1/+1 and has vigilance.
When enchanted creature dies, manifest the top card of your library. (Put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

When Sun-Blessed Mount enters the battlefield, you may search your library and/or graveyard for a card named Huatli, Dinosaur Knight, reveal it, then put it into your hand. If you searched your library this way, shuffle it.

Target opponent reveals their hand. You choose a nonland card from it. That player discards that card.
Amass 1. (Put a +1/+1 counter on an Army you control. If you don't control one, create a 0/0 black Zombie Army creature token first.)

Weapon Rack enters the battlefield with three +1/+1 counters on it.
: Move a +1/+1 counter from Weapon Rack onto target creature. Activate this ability only any time you could cast a sorcery.