mtg all warhammer cards 40,000 Magic: The Gathering Universes Beyond:

Duelists Heritage This seems strong

Pets dont give the player any in-game advantages, and are more an effort to entice players into buying in-game currency to show off against their opponents

Tinker First Printed: 1999-FEB Banned: 2009-MAR Tinkers ability to get high-cost artifacts into play in the very early game often results in games ending extremely quickly, or being locked down to the point where players cannot interact meaningfully

From my own observations, spells have generally gotten weaker while creatures have generally gotten stronger

Eldrazi Conscription and Octopus Umbra should be at the top of your list

Finally, there is Castle Ardenvale which gives you the ability to create a 1/1 if you have no cards in hand or are in a tough situation and need a creature on the spot