Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Whenever you crank Targeting Rocket, target creature blocks this turn if able.

, Sacrifice Teacher's Pet: Search your library for a card with augment, combine it with target host you control, then shuffle your library.

, : Roll a six-sided die. Create a number of 1/1 red Brainiac creature tokens equal to the result.
Tap three untapped Brainiacs you control: The next time you would roll a six-sided die, instead roll two six-sided dice and use the total of those results.

Players play a Magic subgame, starting at 1 life and using their libraries as their decks. For the rest of the main game, if a source would deal damage to a player who didn't win the subgame, it deals double that damage to that player instead.

The Grand Calcutron can be your commander.
When The Grand Calcutron enters the battlefield, each player's hand becomes a program (an ordered row of revealed cards).
Players can only play the first card of their program.
If a card would be put into a player's hand from anywhere, that player reveals it and places it anywhere within their program instead.
At the beginning of each player's end step, if that player's program has fewer than five cards, they draw cards equal to the difference.

Triple strike (This creature deals first-strike, regular, and last-strike combat damage.)

Whenever you crank Thud-for-Duds, roll two six-sided dice. Thud-for-Duds deals damage to target creature equal to the difference between those results.

Roll a six-sided die. Put target nonland permanent into its owner's library just beneath the top X cards of that library, where X is the result.

Whenever you crank Top-Secret Tunnel, target creature can't be blocked this turn.

Whenever you crank Tread Mill, until end of turn, target creature gets +1/+2, gains vigilance, and becomes an artifact in addition to its other types.

Whenever you crank Turbo-Thwacking Auto-Hammer, target creature gains double strike until end of turn.

Whenever you crank Twiddlestick Charger, tap or untap target creature.

[+1]: Head to AskUrza.com and click +1.
[−1]: Head to AskUrza.com and click -1.
[−6]: Head to AskUrza.com and click -6.

Choose two —
• Switch target creature's power and toughness until end of turn.
• Target creature can't be blocked this turn.
• Draw a card. If that card's art is by Wayne England, you may reveal it and draw another card.
• Assemble a Contraption.

Choose two —
• Switch target creature's power and toughness until end of turn.
• Target creature can't be blocked this turn.
• Draw a card. If that card's art is by Wayne England, you may reveal it and draw another card.
• Assemble a Contraption.

Choose two —
• Untap two target permanents.
• Tap each permanent target player controls with exactly one word in its name.
• Discard all the cards in your hand, then draw that many cards.
• Return target instant or sorcery card from your graveyard to your hand.

Choose two —
• Draw a card from an opponent's library.
• Copy target instant or sorcery spell. You may choose new targets for the copy.
• Until end of turn, target creature loses all abilities and becomes a blue Frog with base power and toughness 1/1.
• Create a 1/1 colorless Gnome artifact creature token.