The more critters you cast with big numbies, the bigger Pollywog Prodigy becomes
That ability uses generic mana, so you can use mana rocks like Sol Ring or Mana Crypt to activate it, making it easier to draw extra cards or ramp
"Max speed [ability]" means "As long as you have max speed, this object has [ability]." If the granted ability functions in a zone other than the battlefield, the max speed ability does too

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This does nothing, for example, to protect against Rush characters
9 Mind Twist Disrupt The Opponent's Strategy Estimated Value: $1,250 This is an interesting card that forces the opponent to discard cards from their hand