Cards like The Queen, Commanding Presence and Gaston, Intellectual Powerhouse are about as tricky as things get, but they simply do what they say on the card and get players used to the powerful (at least in my eyes) shift mechanic, which is a cost reduction method
You can assemble a handful of infinite combos with cards like Bloom Tender and Deadeye Navigator or play a clean game with multiple activations from cards like The One Ring and Yisan, the Wanderer Bard
When Chaos needs a favor SWITCH DESIGN THEORY I look to red rares
2) Cut each card in half vertically
The need for many creatures makes Gaea's Cradle more restrictive than other fast mana, but its still amazing
These are available as a bonus sheet, coming in rare and mythic rare only (35 rares and 10 mythics are getting this treatment)