In Limited events, your sideboard is considered to have as many cards named Plains, Island, Swamp, Mountain, and Forest as needed
Top examples- Raging T-Rex, Noble Unicorn, Triceratops, Thoughtplucker Tempo changing targeted removal
Token makers, recursive creatures, death triggers, discard outlets, and aristocrat payoffs all share pieces
It makes it laughably easy to build up a lethal board and even reduces your dependence on Feather ever-so-slightly
In the first situation, if you flicker an aura with an effect like Flicker of Fate, it comes into play and must be attached to a legal permanent
Cards like Generous Patron and The Council of Four make sure you benefit from all the extra card draw, counters, and so forth that you're bestowing on the table