Regirock

When this creature is in the exile zone, it
may be summoned for {2} more mana than
it's summoning cost
{2}{r}{r}{t}: Until Regirock untaps, every
time an opponents summons a creature, deal
half Regirock's power as damage to that creature
(rounded down).
Regirock was sealed away by people long ago. The
rocks that compose its body were unearthed from
different locations.