• Type: Action
• Cost: 4
• Effect: Gain a card costing up to $4, putting it on top of your deck.

Terminal, but the topdeck-on-gain clause is exceptional. Next turn the gained card almost always enters your hand, fast-tracking deck-building. A-tier.

Opening: $4 Armory → next turn gain a Silver / key 4-cost on top.

Midgame: Each Armory secures a 4-cost engine piece per turn (Witch, Remodel, Forager...).

Endgame: Topdeck Estates for 3-pile tempo or grab final pieces.

• Workshop (3-cost) upgrade: Topdeck speed.
• Apprentice / Procession: Trash Armory for 5-cost.
• Remodel: Armory → Gold.
• Throne Room: 2 gains.

• All key 4-costs: Witch, Remodel, Forager.
• Silver: 5-cost engine acceleration.
• Masquerade: Topdeck synergy.
• Gardens: Mass-gain VP.
• Smithy: Topdeck for next-turn play.

• 5+ cost-heavy boards: No targets.
• Pre-Chapel thin decks: Gain works against thinning.
• Terminal-heavy: Armory is terminal too.
• Silver-heavy decks: Topdecking Silver locks next hand.

Pick the gain by "what do I want to draw next turn?" Engine cores (village+draw) topdecked = instant activation.

Armory itself is great trash-target. Procession Armory: 2 gains + trash + 5-cost gain. Triple-effect turn.

Workshop's superior cousin — same cost +1 with topdeck. Stays useful into late game.