Menace (This creature can't be blocked except by two or more creatures.)
When Relentless Dead dies, you may pay . If you do, return it to its owner's hand.
When Relentless Dead dies, you may pay . If you do, return another target Zombie creature card with converted mana cost X from your graveyard to the battlefield.

Target permanent gains indestructible until end of turn. Create a 1/1 colorless Servo artifact creature token. (Effects that say "destroy" don't destroy a permanent with indestructible, and if it's a creature, it can't be destroyed by damage.)

Flying (This creature can't be blocked except by creatures with flying or reach.)
When Riddlemaster Sphinx enters the battlefield, you may return target creature an opponent controls to its owner's hand.

, Pay 1 life, Sacrifice Scalding Tarn: Search your library for an Island or Mountain card, put it onto the battlefield, then shuffle your library.

Whenever a creature dies, scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)
: Each opponent loses 2 life and you gain 2 life. Activate this ability only if there are four or more creature cards in your graveyard.

Target creature gets +0/+5 and gains reach until end of turn. (It can block creatures with flying.)

As an additional cost to cast this spell, you may reveal a Dragon card from your hand.
Counter target spell unless its controller pays . If you revealed a Dragon card or controlled a Dragon as you cast this spell, counter that spell instead.

Target creature gets +1/+1 and gains reach until end of turn. (It can block creatures with flying.)

Choose one —
• Destroy target monocolored creature.
• Destroy target artifact or enchantment.
• Draw two cards, then discard a card.

Draw three cards. Target player mills three cards.

Ugin's Conjurant enters the battlefield with X +1/+1 counters on it.
If damage would be dealt to Ugin's Conjurant while it has a +1/+1 counter on it, prevent that damage and remove that many +1/+1 counters from Ugin's Conjurant.

, Pay 1 life, Sacrifice Verdant Catacombs: Search your library for a Swamp or Forest card, put it onto the battlefield, then shuffle your library.

You may have Vizier of Many Faces enter the battlefield as a copy of any creature on the battlefield, except if Vizier of Many Faces was embalmed, the token has no mana cost, it's white, and it's a Zombie in addition to its other types.
Embalm

Flying
When Watcher in the Mist 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.)