Commander ninjutsu (, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand or the command zone tapped and attacking.)
Whenever a Ninja you control deals combat damage to a player, reveal the top card of your library and put that card into your hand. Each opponent loses life equal to that card's mana value.

(: Add .)

You have no maximum hand size.
: Add .

Equipped creature has haste and shroud. (It can't be the target of spells or abilities.)
Equip

Other Goblins you control get +1/+1.
Whenever this creature or another Goblin you control dies, exile the top card of your library. If it's a Goblin creature card, you may cast that card until the end of your next turn.

Spree (Choose one or more additional costs.)
+ — Untap all creatures you control. If it's your combat phase, there is an additional combat phase after this phase.
+ — Creatures you control get +1/+0 and gain first strike until end of turn.
+ — Choose target opponent. Whenever a creature you control deals combat damage to that player this turn, create a tapped Treasure token.

When Omnath enters, draw a card.
Landfall — Whenever a land you control enters, you gain 4 life if this is the first time this ability has resolved this turn. If it's the second time, add . If it's the third time, Omnath deals 4 damage to each opponent and each planeswalker you don't control.

Destroy target artifact.

Equipped creature has hexproof and can't be blocked.
Equip—, Pay 2 life.

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When this creature enters, open an Attraction. (Put the top card of your Attraction deck onto the battlefield.)

This land enters tapped.
: Add , , or .

Flash
This enchantment enters with X fire counters on it.
If a source you control would deal damage to an opponent or a permanent an opponent controls, it deals that much damage plus an amount of damage equal to the number of fire counters on this enchantment instead.

, : Choose a number greater than 0 and a color. Target opponent reveals their hand. If that opponent reveals exactly the chosen number of cards of the chosen color, you draw a card.

Counter target spell unless its controller pays . If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

: Heartless Hidetsugu deals damage to each player equal to half that player's life total, rounded down.

: Destroy target Wall.

Enchant creature
Enchanted creature has "At the beginning of your upkeep, target opponent gains control of this creature unless you sacrifice a land."

You have no maximum hand size.
: Add .

: Add .
, : Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)