Infinite counters on the last 5 creatures

This creature can't block. Sacrifice a creature: Put a +1/+1 counter on this creature.

Enchant creature Enchanted creature has ": This creature gets +1/+1 until end of turn." When enchanted creature dies, return that card to the battlefield under your control.

Shroud (This creature can't be the target of spells or abilities.) Whenever another creature dies, you may put a +1/+1 counter on this creature.

First strike Whenever another creature dies, you may put a +1/+1 counter on this creature.

Flying Whenever another creature dies, you may put a +1/+1 counter on this creature.

Vigilance Whenever this creature enters or attacks, you may return target permanent card with mana value 3 or less from your graveyard to the battlefield.

Whenever another creature you control dies, put a +1/+1 counter on this creature.

Sacrifice a creature: Put a +1/+1 counter on this creature.

Whenever this creature deals combat damage to a player, put a +1/+1 counter on it. Whenever another creature dies, put a +1/+1 counter on this creature.

Enchant creature When enchanted creature dies, return that card to the battlefield under your control.