Kanadeko, Nature's Defiance

Kanadeko has +1/+1 for each experience counter
you have. Whenever an Elf would be exiled or destroyed, instead exile it and gain 1 experience counter and place that many chain counters on it.
When an Elf you control deals combat damage to
a player, remove a chain counter from each elf
in exile this way.
When an Elf no longer has any chain
counters on it, it enters the battlefield
under your control.