Artifact, instant, and sorcery spells you cast cost less to cast.
: If you both own and control Urza, Lord Protector and an artifact named The Mightstone and Weakstone, exile them, then meld them into Urza, Planeswalker. Activate only as a sorcery.

When Urza enters, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control."
Tap an untapped artifact you control: Add .
: Shuffle your library, then exile the top card. Until end of turn, you may play that card without paying its mana cost.

Affinity for artifact creatures
Artifact creatures you control have menace.
At the beginning of your end step, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control."

Read ahead (Choose a chapter and start with that many lore counters. Add one after your draw step. Skipped chapters don't trigger. Sacrifice after III.)
Scry 4, then you may reveal the top card of your library. If a planeswalker card is revealed this way, put it into your hand.
You may put a planeswalker card with mana value 6 or less from your hand onto the battlefield.
You may activate the loyalty abilities of planeswalkers you control twice this turn rather than only once.

: Urza deals 1 damage to any target.

Starting & Max Hand Size: -1
Starting Life: +10

When this creature enters, the Ring tempts you.

Whenever you cast a Myr spell, create a 1/1 colorless Myr artifact creature token.
At the beginning of combat on your turn, untap each Myr you control.
, : Put three +1/+1 counters on each Myr you control. Activate only during your turn.

Trample
At the beginning of combat on your turn, mill a card and choose an opponent at random. This creature attacks that player this combat if able. Until end of turn, this creature gains indestructible and gets +1/+1 for each card type among cards in your graveyard.

This creature enters prepared.
Whenever you cast a spell that isn't from your starting deck, conjure a card named Bear Cub onto the battlefield. This creature becomes prepared.

This creature enters with four healing counters on it.
Remove a healing counter from this creature: Prevent the next 1 damage that would be dealt to this creature this turn.
: Put a healing counter on this creature.

: This creature gets +3/+3 and becomes a Bear Berserker until end of turn. Activate only once each turn.

: Target creature gets +1/+1 until end of turn.

When Uro enters, sacrifice it unless it escaped.
Whenever Uro enters or attacks, you gain 3 life and draw a card, then you may put a land card from your hand onto the battlefield.
Escape — , Exile five other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)

: Add one mana of any color.
, , Sacrifice this artifact: Destroy target creature or enchantment.

Hexproof
Uril gets +2/+2 for each Aura attached to it.

Whenever you play a land from exile or cast a spell from exile, you gain 2 life.
Draw Arcanum — : Look at the top card of your library. You may exile it face down.
Play Arcanum — : Until end of turn, you may play cards exiled with Urianger Augurelt. Spells you cast this way cost less to cast.

Flying
Whenever Urgoros deals combat damage to a player, that player discards a card at random. If the player can't, you draw a card.

: Add .

As an additional cost to cast this spell, collect evidence X, where X is the total mana value of the permanents this spell targets.
Destroy up to one target artifact, up to one target creature, up to one target enchantment, and up to one target planeswalker.

Destroy target Spirit or enchantment.

Target creature gets -3/-3 until end of turn. You may tap any number of untapped Vampire creatures you control. If you do, put a +1/+1 counter on each of those Vampires.

Return target creature to its owner's hand.
Harmonize

This spell costs less to cast for each Dragon card in your library.
Seek a Dragon card.
Harmonize

Flying, protection from white and from black
When Ureni enters, it deals X damage divided as you choose among any number of target creatures and/or planeswalkers your opponents control, where X is the number of lands you control.

Flying, trample
Whenever Ureni enters or attacks, look at the top eight cards of your library. You may put a Dragon creature card from among them onto the battlefield. Put the rest on the bottom of your library in a random order.

First strike
Creatures with swampwalk can be blocked as though they didn't have swampwalk.