I have a nice pair of Double Masters preview cards for you today, and they are cards often seen together.
Thopter Foundry and Sword of the Meek combine to make a 1/1 flier and gain a life for every mana spent (you sacrifice the Sword to the Foundry, and the new token brings the Sword back from the graveyard). This combo has seen various amounts of play every since Alara Reborn, including spending some time on the Modern banned list.
A recent addition to this pair is Urza, Lord High Artificer, as Urza lets you tap the Sword and the tokens for mana, making this an infinite life / infinite mana combo (which even lets you activate Urza for your whole deck if you desire).
This is a sweet combo to pull off in draft, and if you ever see both these cards in the same pack, I’d recommend snapping them up.
Thanks to Wizards for these free preview cards, and I can’t wait to get a chance to assemble voltron!