mtg whenever you target a creature draw a card Tamiyo, Field Researcher Rules Text: whenever, draw a

This means you can self-mill as a cheaper form of card draw, or you can sacrifice artifacts to cards like Kuldotha Forgemaster and still get them back

If you pay 2 mana and tap the artifact, it can then be sacrificed to allow players to search their library for a basic land card and put it onto the battlefield tapped

Regal Caracal Regal Caracal may be expensive to cast, but the card gives +1/+1 and Lifelink to every other Cat under your control

One of the long shots that could truly mess up the Standard metagame is an innocuous 3/3 flash creature with a wacky ability, one that combines with an even wackier instant from Kaladesh to draw your entire deck