Whenever an opponent casts a spell from their hand, you may reveal the top card of your library. If it shares a card type with that spell, counter that spell and that opponent may cast the revealed card without paying its mana cost.

As this enchantment enters, choose a color word.
All instances of color words in the text of spells and permanents are changed to the chosen color word.

Choose one or both —
• Put target creature on top of its owner's library.
• Return target creature to its owner's hand.

Exchange control of two target creatures.

Commander creatures you own have "Whenever this creature attacks a player, if no opponent has more life than that player, this creature can't be blocked this turn."

This creature can't be blocked as long as you've cast a noncreature spell this turn.

Sygg can't be blocked.
Whenever this creature enters or transforms into Sygg, Wanderwine Wisdom, target creature gains "Whenever this creature deals combat damage to a player or planeswalker, draw a card" until end of turn.
At the beginning of your first main phase, you may pay . If you do, transform Sygg.

Return target creature to its owner's hand.
Draw a card.

Flying
Magecraft — Whenever you cast or copy an instant or sorcery spell, target creature you control has base power 2 until end of turn.

Whenever a Sliver deals combat damage to a player, its controller may draw a card.

This spell costs less to cast if you control at least two creatures that share a creature type.
Put target nonland permanent into its owner's library second from the top.

All Sliver creatures have vigilance.

, : Tap X target noncreature artifacts.
, : Untap X target noncreature artifacts.

Improvise
You may have this creature enter as a copy of any creature on the battlefield, except it's a Synth artifact creature in addition to its other types.

( can be paid with either or 2 life.)
, , Exile a spell you control: Target opponent reveals cards from the top of their library until they reveal a card with mana value equal to 1 plus the exiled spell's mana value. Exile that card, then that player shuffles. You may cast that exiled card without paying its mana cost.

Station (Tap another creature you control: Put charge counters equal to its power on this Spacecraft. Station only as a sorcery. It's an artifact creature at 9+.)
2+: At the beginning of combat on your turn, up to one other target artifact you control becomes an artifact creature with base power and toughness 2/2 and gains flying until end of turn.
9+: Flying, vigilance
4/4

Exile all creatures you control. At the beginning of the next end step, reveal cards from the top of your library until you reveal that many creature cards, put all creature cards revealed this way onto the battlefield, then shuffle the rest of the revealed cards into your library.

Counter target creature or planeswalker spell. Create a Blood token.

Taeko enters tapped.
Whenever another creature you control leaves the battlefield, if it didn't die, scry 1 and put a +1/+1 counter on Taeko.
Whenever Taeko attacks, you may pay . When you do, target attacking creature can't be blocked this turn.

Flurry — Whenever you cast your second spell each turn, copy it, then exile the spell you cast with four time counters on it. If it doesn't have suspend, it gains suspend.

Surveil 5.

Target creature gets +2/+0 until end of turn and can't be blocked this turn.
Rebound

Scry 2. (Then exile this card. You may cast the creature later from exile.)

Enchant creature
Enchanted creature gets +1/+0 and has flying and "Whenever this creature attacks, draw a card."

Tap target creature. It doesn't untap during its controller's next untap step.

Draw a card, then draw cards equal to the number of cards named Take Inventory in your graveyard.

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

Split second
Enchant permanent
You control enchanted permanent.