And of course, Sword of Hearth and Home
Sea Gate Oracle is a hero for finding that land
Some tier 3 monsters are such powerhouses or have such useful abilities that they can still be useful by end of the game (for example Red Chocobos with incredible movement, high stats, and access to Chocobo Meteor, a very powerful far-ranged attack with no cost and no charge time), but most monsters will end up with no real use other than breeding a coveted tier 3 monster in their species line, or easy poaching of rare items/equipment
If Gaston - Pure Paragon does make it out onto the board, he's certainly battle-ready, with ten strength, six willpower, and the Rush ability
Sazhs Chocobo is one example of many, According to the WeeklyMTG stream
A green artifact for six mana, rather than having one's lands produce mana the traditional way, Bootleggers' Stash allows its controller's lands to be tapped in order to produce Treasure tokens