Hailing Frequencies — As Nyota Uhura enters, choose a number between 0 and 10.
Open a Channel — Whenever an opponent casts a spell with mana value equal to the chosen number, you draw a card.

You have no maximum hand size.
Sonic Booster — Whenever Nyssa of Traken attacks, sacrifice any number of artifacts. When you sacrifice one or more artifacts this way, tap up to that many target creatures and draw that many cards.
Doctor's companion (You can have two commanders if the other is the Doctor.)

Bestow
Enchanted creature gets +2/+3.

, Remove a counter from a nonland permanent you control: Draw a card.

Flying, vigilance
: Add . Spend this mana only to cast an artifact spell or activate an ability of an artifact source.

When Oath of Jace enters, draw three cards, then discard two cards.
At the beginning of your upkeep, scry X, where X is the number of planeswalkers you control.

At the beginning of each player's upkeep, that player chooses target player who has more cards in hand than they do and is their opponent. The first player may discard their hand and draw three cards.

Flying
, Return a land you control to its owner's hand: Untap target land.

Flying
, Return a land you control to its owner's hand: Target creature gets -X/-0 until end of turn, where X is the number of cards in your hand.

Flying
: This creature gains lifelink until end of turn.

Flash
Enchant creature an opponent controls
When this Aura enters, remove enchanted creature from combat. Then draw a card for each tapped creature its controller controls.
Enchanted creature loses all abilities and can't attack or block.

Flying
Ward
Whenever Obsessive Collector deals combat damage to a player, seek a card with mana value equal to the number of cards in your hand.

Draw a card.
Madness

Flying
When this creature enters, tap target creature an opponent controls. Goad it.

This spell costs less to cast if you have eight or more instant and/or sorcery cards in your graveyard.
Ward
Magecraft — Whenever you cast or copy an instant or sorcery spell, target creature has base power and toughness 8/8 until end of turn.

When Octo Opus enters, create a 4/4 blue Octopus Performer creature token named Contortionist with "At the beginning of your upkeep, you may fold this token in half." (It becomes 2/2, then 1/1, ½/½, and so on.)
Sacrifice Octo Opus: Draw a card and an additional card for each of Contortionist's folds.

When this creature enters, scry 2.

Target creature you control gets +1/+1 and gains hexproof until end of turn. Untap it.

Enchant creature
Enchanted creature has base power and toughness 8/8 and has "Whenever this creature attacks, you may tap target creature with power 8 or less."
Umbra armor

Enchant creature
Enchanted creature has ": Draw a card."
: Enchanted creature gains vigilance until end of turn.

When this creature dies, you may draw a card.

Flying
As long as you control a transformed permanent, this creature has "When this creature dies, draw a card."

This spell costs less to cast if you control a Human creature and a non-Human creature.
Draw two cards.

At the beginning of your upkeep, look at the top two cards of your library, then put one of them into your graveyard.
Whenever a creature card is put into your graveyard from your library or hand, it perpetually gains "When this card leaves your graveyard, create a tapped 2/2 black Zombie creature token."

Flying
Whenever you cast an instant spell from your hand, it gains rebound.
When Ojer Pakpatiq dies, return it to the battlefield tapped and transformed under its owner's control with three time counters on it.

Flying
Megamorph

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