Put in Context (Blue)

This can only defend an attack with 3 or less base

Put in Context cannot be played if it would defend an attack with 3 or less base . Base is typically the printed power of the card.
If Put in Context is played against an attack with 3 or less base but then the base of the attack has more than 3 when Put in Context begins to resolve, Put in Context fails to resolve as it can’t become a defending card due to its own effect.
Put in Context remains a defending card on the chain link if the base of the attack its already defending against becomes more than 3.