Cogwork ProgenitorHow it works & interactions with other cards

What It Does

Cogwork Progenitor triggers at the beginning of your end step. It gives you the option to exile either another artifact you control on the battlefield or an artifact card from your graveyard. If you choose to exile a card, you 'seek' an artifact card—meaning a random artifact card is moved from your library to your hand. That new card receives a perpetual modification, changing its base power and toughness to 1/1 and adding the Gnome creature type to its existing types.

Step-by-Step Resolution

First, the ability triggers as your end step begins and is put onto the stack. When it resolves, you choose whether to exile a qualifying artifact. If you do, the game searches your library for a random artifact card. That card is immediately modified with the perpetual 1/1 stat line and Gnome type before it enters your hand. Because the change is perpetual, the card will remain a 1/1 Gnome even if it moves between zones, such as being discarded or returned from the graveyard later.

Common Mistakes

A common point of confusion is the 'perpetual' keyword; unlike temporary buffs, these changes last for the rest of the game regardless of where the card goes. Also, remember that Cogwork Progenitor cannot exile itself to trigger its own ability because the text specifies 'another artifact'. Lastly, if you have no artifact cards remaining in your library, the seek action will fail, even if you successfully exiled a card from the battlefield or graveyard.

When to Play It

This card is best utilized in decks that can afford to lose low-impact artifacts or have ways to fill the graveyard. It is particularly strong for turning late-game mana rocks or spent artifacts into creatures that can pressure the opponent or provide utility. Since it triggers at the end step, you can benefit from it the same turn it is played, provided you have a sacrifice or exile target ready.

Interaction examples

Scaling Power with Gnomes

Esper Sentinel

If Cogwork Progenitor seeks an Esper Sentinel, the Sentinel becomes a 1/1 Gnome. While its base power is 1/1, its ability still functions: opponents must pay {X} to prevent you from drawing cards, where X is the Sentinel's power. If you later buff the Gnome's power, the tax increases normally.

Recycling Mana Dorks

Ornithopter of Paradise

You can exile an Ornithopter of Paradise from your graveyard that was destroyed earlier in the game. Cogwork Progenitor will then seek a new artifact from your deck. The new card will be a 1/1 Gnome creature, providing you with a fresh body and a potential new set of abilities while thinning your deck.