Scuttling Doom Engine

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for 1 or one mana of that creature's color.) Create three 1/1 white Spirit creature tokens with flying.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for 1 or one mana of that creature's color.) When this creature enters, you may put a +1/+1 counter on another target creature.

Flash (You may cast this spell any time you could cast an instant.) Flying When this creature enters, sacrifice it unless you return another creature you control to its owner's hand.

Whenever another red creature you control enters, this creature gets +1/+0 until end of turn.

Until end of turn, each creature target player controls loses all abilities and becomes a blue Frog with base power and toughness 1/1.

This spell can't be countered. Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

(T: Add R.)

Flying (This creature can't be blocked except by creatures with flying or reach.) First strike (This creature deals combat damage before creatures without first strike.)