Sandwurm Convergence

Creatures with flying can't attack you or planeswalkers you control.
At the beginning of your end step, create a 5/5 green Wurm creature token.

Prodigious Growth

Enchant creature
Enchanted creature gets +7/+7 and has trample.

{T}: Add {G}. If you control four or more creatures, add {G}{G} instead.

Heroes' Bane enters with four +1/+1 counters on it.
{2}{G}{G}: Put X +1/+1 counters on Heroes' Bane, where X is its power.

Flash
Whenever a player taps a land for mana, that player adds one mana of any type that land produced.

This spell can't be countered.
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. All creatures able to block it this turn do so.

This spell costs {X} less to cast, where X is the total power of creatures you control.
Trample

Trample
When Pelakka Wurm enters, you gain 7 life.
When Pelakka Wurm dies, draw a card.

When you cast this spell, create a 10/10 colorless Eldrazi creature token.