, Discard a card: Search your library for a card that shares a complete word in its name with the discarded card, reveal it, put it into your hand, then shuffle your library.

As Urza's Incubator enters the battlefield, choose a creature type.
Creature spells of the chosen type cost less to cast.

: Add . If you control an Urza's Power-Plant and an Urza's Tower, add instead.

Whenever an artifact you control is put into a graveyard from the battlefield, if it wasn't sacrificed, you may pay . If you do, draw a card.

: Add . If you control an Urza's Mine and an Urza's Tower, add instead.

(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.)
Exile all nonland permanents that aren't legendary.

: Roll a six-sided die. Urza's Science Fair Project gets the indicated result.
1 — It gets -2/-2 until end of turn.
2 — Prevent all combat damage it would deal this turn.
3 — It gains vigilance until end of turn.
4 — It gains first strike until end of turn.
5 — It gains flying until end of turn.
6 — It gets +2/+2 until end of turn.

, : Draw a card. Then discard a card unless you exile a historic card from your graveyard. (Artifacts, legendaries, and Sagas are historic.)

: Add . If you control an Urza's Mine and an Urza's Power-Plant, add instead.

When Urza, Lord High Artificer enters the battlefield, create a 0/0 colorless Construct artifact creature token with "This creature 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.

Return target permanent you control to its owner's hand. (Then exile this card. You may cast the creature later from exile.)

When Utility Knife enters the battlefield, attach it to target creature you control.
Equipped creature gets +1/+1.
Equip (: Attach to target creature you control. Equip only as a sorcery.)

Flying
, Return two lands you control to their owner's hand: Copy target instant or sorcery spell. You may choose new targets for the copy.

Replicate (When you cast this spell, copy it for each time you paid its replicate cost. You may choose new targets for the copies.)
Return target creature to its owner's hand.

This spell costs less to cast for each creature type among creatures you control. This effect can't reduce the amount of mana this spell costs by more than .
Changeling (This card is every creature type.)
Double strike

Other Knights you control get +1/+1.
: Knights you control gain double strike until end of turn.

Whenever you cycle another card for the first time each turn, create a 1/1 white Human Soldier creature token.
Cycling (, Discard this card: Draw a card.)

First strike
As long as Valor is in your graveyard and you control a Plains, creatures you control have first strike.

Target creature can block any number of creatures this turn.