While there are a few other possible options, they feel less likely due to power level or complexity than everybodys favorite giant killer zombie
So, at the moment, there are three types of trainers: Item
The Brothers' War , a new event set for Magic: The Gathering , has two types of cards catching the attention of investors: Meld cards and artifacts
You can always activate an ability that instructs a creature to adapt
Sheldon Menery, the godfather of Commander and head of the RC, even said that the card is too generically good and pleaded with Wizards to Please never print this card (Wizards apparently asks the RC for input during card design)
This made Intuition with Accumulated Knowledge a go-to draw engine for a very long period of time