Doubling Season [Modern Masters] Mirrodin Besieged Creatures your opponents control with

Creatures your opponents control with counters on them can't attack or block

As Nameless Race enters the battlefield

Ob Nixilis Type: Sorcery Rarity: Common Cost: {B} Each player sacrifices a creature

Set: Legions Type: Creature — Specter Rarity: Rare Cost: {1}{B}{B} Flying

Set: Conspiracy Type: Instant Rarity: Common Cost: {G} Put a +1/+1 counter on target creature

Doubling Season [Modern Masters] Mirrodin Besieged Creatures your opponents control withSet: Modern Masters Type: Enchantment Rarity: Rare Cost: {4}{G} If an effect would create one or more tokens under your control, it creates twice that many of those tokens instead. If an effect would put one or more counters on a permanent you control, it puts twice that many of those counters on that permanent instead.