Hatchery Sliver

Flash

Any player may cast Sliver spells as though they had flash.

Each spell you cast that's red or green costs less to cast.

Each creature card in your graveyard has scavenge. The scavenge cost is equal to its mana cost. (Exile a creature card from your graveyard and pay its mana cost: Put a number of +1/+1 counters equal to that card's power on target creature. Scavenge only as a sorcery.)

Sacrifice another creature: Regenerate Varolz.

Each creature spell you cast with mana value 4 or greater has blitz. The blitz cost is equal to its mana cost. (You may choose to cast that spell for its blitz cost. If you do, it gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step.)

Blitz costs you pay cost less for each time you've cast your commander from the command zone this game.

The first kicked spell you cast each turn costs less to cast.

Whenever you cast a kicked spell, put a +1/+1 counter on this creature.

Red spells and white spells you cast cost less to cast.