Waste Not is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Whenever an opponent discards a creature card, create a 2/2 black Zombie creature token. Whenever an opponent discards a land card, add . Whenever an opponent discards a noncreature, nonland card, draw a card.

Complete guide

Waste Not is a powerful enchantment that turns your opponent's misfortune into your direct advantage. By capitalizing on every card your opponent discards, you can generate mana, creatures, and card draw all at once. Whether you are playing a dedicated discard strategy or just looking for value, this card is a centerpiece for black-aligned decks.

What it Does

Waste Not features a triggered ability that watches your opponents. Every time an opponent discards a card, the enchantment checks the card's types and triggers a specific effect based on what was lost. Because it triggers for each card, mass discard spells can result in a massive windfall of resources.

How it Resolves

When an opponent discards a card, Waste Not identifies the type. If it is a creature card, a 2/2 black Zombie creature token is placed onto the battlefield. If it is a land, you add two black mana to your mana pool. If it is anything else (a noncreature, nonland card like an artifact or instant), you draw a card. If multiple cards are discarded simultaneously, each one triggers the ability separately, and you choose the order they are put on the stack.

Common Mistakes

A frequent error is forgetting that Waste Not only triggers when an opponent discards a card. If an opponent exiles a card from their hand or mills cards from their library, Waste Not will not trigger. Additionally, remember that the mana added from the land trigger will disappear as the current step or phase ends, so you must use it quickly.

When to Play It

Waste Not is most effective in the early game where you can maximize the number of cards an opponent has left to discard. It pairs perfectly with 'wheels' or spells that force players to discard their entire hands, as the sheer volume of triggers can often win the game on the spot by generating enough mana and cards to continue your turn indefinitely.

Interaction examples

Generating an Undead Army

Zombie

If your opponent discards a creature card, Waste Not triggers. Upon resolution, you create a 2/2 black Zombie token. This provides you with an immediate board presence without spending extra mana.

Resource Engine

Phyrexian Arena

While Phyrexian Arena provides steady card draw during your upkeep, Waste Not supplements this by punishing opponents who try to hold onto cards. If an opponent discards a noncreature, nonland spell, you draw an additional card, keeping your hand full alongside your Arena triggers.

Strategic Mana Management

Black Market Connections

If you choose to use Black Market Connections to create a Shapeshifter, you might be low on mana for other spells. If you then force an opponent to discard a land, Waste Not adds two black mana to your pool, which you can use to cast the spells you drew from the Buy Information mode of your Connections.

Guide written with AI from the official text and rulings. Official English text prevails.