As long as X is in X's owner's opponent's hand, X's owner may cast X and activate X's abilities. That opponent can't cast X and plays with their hand revealed.
{U}{B}, {T}: Put X into target opponent's hand.
{3}{U}{B}: You may play a land or cast a spell from the hand X is in. If you cast a spell this way, you cast it without paying its mana cost.

Chatzuk, Mighty Guitarist

Banding (Just ask around until you find someone who knows.)
Creature spells you cast with banding cost {2} less to cast.
Whenever two or more creatures you control attack in a band, each creature in that band gets +1/+1 until end of turn for each creature in that band.

Grusilda, Monster Masher

Combined, enchanted, and equipped creatures you control have menace.
{3}{B}{R}, {T}: Put two target creature cards from graveyards onto the battlefield combined into one creature under your control. (Its power is equal to their total power, its toughness is equal to their total toughness, and it has their names, mana costs, types, text boxes, etc.)

Halana and Alena and Gisa and Geralf

First strike, reach
At the beginning of combat on your turn, mill four cards. You may choose a creature card from among them and cast it. When you do, it gains haste, becomes a Zombie in addition to its other types, and enters the battlefield with X +1/+1 counters on it, where X is Halana and Alena and Gisa and Geralf's power.

Oddric, Lunar Marquis

At the beginning of each combat, creatures you control gain banding until end of turn if a creature you control has banding. The same is true for changeling, devoid, fear, flanking, horsemanship, ingest, intimidate, landwalk, shroud, tantrum, wither, and the activated ability "Sacrifice this creature: Add {C}."

Anax and Cymede & Kynaios and Tiro

First strike, vigilance
Heroic — Whenever you cast a spell that targets Anax and Cymede & Kynaios and Tiro, draw a card. Each player may put a land card from their hand onto the battlefield, then each opponent who didn't draws a card.

Koma and Toski, Compleated

This spell can't be countered.
At the beginning of each upkeep, create a 1/1 Phyrexian Serpent Squirrel artifact creature token named Toski's Coil with "Whenever this creature deals combat damage to a player, draw a card."
Sacrifice another Serpent or Squirrel: Choose one —
• Target creature attacks this turn if able. Its activated abilities can't be activated this turn.
• Koma and Toski, Compleated gains indestructible until end of turn.

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