Yeva's Forcemage

When Yeva's Forcemage enters, target creature gets +2/+2 until end of turn.

Blanchwood Armor

Enchant creature
Enchanted creature gets +1/+1 for each Forest you control.

Reach (This creature can block creatures with flying.)

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

Target creature gets +3/+3 until end of turn.

When Ondu Giant enters, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle.