Cleansing Screech deals 4 damage to any target.

+1: Target creature gets +2/+2 until end of turn.

−1: If you don't control a creature named Mowu, create Mowu, a legendary 3/3 green Dog creature token.

−5: Until end of turn, target creature gains trample and gets +X/+X, where X is the number of lands you control.

Vivid Flying Fish has flying as long as it's attacking. (It can't be blocked except by creatures with flying or reach.)