pokemon cards mega charizard ex secret rare M (X) (Secret) - XY Ultra Rare Card Type Mega Charizard EX 2014 Pokemon

Dramatic Scepter Cards: Dramatic Reversal + Isochron Scepter Prerequisites: You have nonland permanents that can tap for 3 or more mana and Isochron Scepter has imprinted Dramatic Reversal

Land Tax is a pretty solid example

That's not counting beyond boosters, value boosters (only sold in major retailers) or Secret Lair drops (a massive headache, as Jeff noted), ancillary products like playmats and tokens, tickets to MagicCon, digital cosmetics like companions, or Avatars in Magic Arena

My collection no longer fits in a single white box

Five Rare Bonus Bombs As mentioned, on top of the three main Final Fantasy Bonus Cards, there are five rare randomly available options

The caveat is that you need to skip chapters