Valley Floodcaller + Sensei's Divining Top + Poison Dart Frog + Experimental Frenzy

Valley Floodcaller

Sensei's Divining Top

Poison Dart Frog

Experimental Frenzy

How it works

1. Activate Poison Dart Frog's first ability by tapping it, adding 1.
2. Activate Sensei's Divining Top's second ability by tapping it, causing you to draw a card and put Sensei's Divining Top from the battlefield onto the top of your library.
3. Cast Sensei's Divining Top from the top of your library by paying 1.
4. Valley Floodcaller triggers, giving Birds, Otters, Frogs and Rats you control +1/+1 until end of turn and untapping them.
5. Repeat.

This ingenious setup turns a simple artifact into an infinite engine by utilizing experimental Frenzy to bypass the hand restriction and cast Sensei's Divining Top directly from the top of your library. As you repeatedly tap Sensei's Divining Top to draw a card and place it back atop your library, Poison Dart Frog provides the necessary mana to recast it. Meanwhile, Valley Floodcaller acts as the linchpin of the combo, its passive flash-granting ability letting you cast the artifact at instant speed while its triggered ability untaps Poison Dart Frog every time a noncreature spell is cast, allowing the loop to continue indefinitely.