Life Burst

Target player gains 4 life, then gains 4 life for each card named Life Burst in each graveyard.

Growth Cycle

Target creature gets +3/+3 until end of turn. It gets an additional +2/+2 until end of turn for each card named Growth Cycle in your graveyard.

Draw a card, then draw cards equal to the number of cards named Accumulated Knowledge in all graveyards.

This creature gets +1/+0 for each other Rat you control.
A deck can have any number of cards named Rat Colony.

This creature gets +1/+1 for each other creature on the battlefield named Relentless Rats.
A deck can have any number of cards named Relentless Rats.