Demonic Tutor

Search your library for a card, put that card into your hand, then shuffle.

Overrun

Creatures you control get +3/+3 and gain trample until end of turn.

Shadowspear

Equipped creature gets +1/+1 and has trample and lifelink.
{1}: Permanents your opponents control lose hexproof and indestructible until end of turn.
Equip {2}

Birds of Paradise

Colossification

Enchant creature
When Colossification enters, tap enchanted creature.
Enchanted creature gets +20/+20.