La saga d'Urza

Flying Whenever Ravenous Skirge attacks, it gets +2/+0 until end of turn.

Sacrifice a creature: Phyrexian Ghoul gets +2/+2 until end of turn.

{B}: Looming Shade gets +1/+1 until end of turn.

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

Destroy target nonartifact, nonblack creature. It can't be regenerated. Cycling {2} ({2}, Discard this card: Draw a card.)

When Cackling Fiend enters the battlefield, each opponent discards a card.

Target creature gets +2/+0 and gains fear until end of turn. (It can't be blocked except by artifact creatures and/or black creatures.)

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

Sacrifice Blood Vassal: Add {B}{B}.

Destroy target land or nonblack creature. It can't be regenerated.

{T}: Return Wizard Mentor and target creature you control to their owner's hand.

When an opponent casts a spell, if Veiled Serpent is an enchantment, Veiled Serpent becomes a 4/4 Serpent creature with "This creature can't attack...

Protection from red Cycling {2} ({2}, Discard this card: Draw a card.)

When an opponent casts a spell, if Veil of Birds is an enchantment, Veil of Birds becomes a 1/1 Bird creature with flying.

Protection from black Cycling {2} ({2}, Discard this card: Draw a card.)

Search your library for up to two Forest cards, reveal those cards, and put them into your hand. Then shuffle your library.

At the beginning of the end step, if no creatures are on the battlefield, sacrifice Pestilence. {B}: Pestilence deals 1 damage to each creature and...

Counter target spell. Untap up to four lands.

{U}: Untap Horseshoe Crab.

Target player gains 2 life for each creature on the battlefield.

Each player returns a creature they control to its owner's hand.

{W}: The next time a white source of your choice would deal damage to you this turn, prevent that damage. Cycling {2} ({2}, Discard this card: Draw...

({T}: Add {G}.)