Hypothetical EnchantmentConsider these two cards:
every time a creature you control getsWhenever a +1/+1 counter is placed on Fathom Mage, discardyou may draw a card or lose one life.
Put two +1/+1 counters on target creature and untap it.
Would Hypothetical Enchantment'sFathom Mage's effect trigger once or twice?
Is either of Rock Hydra's abilities any different? If it comes in to play with counters, does it trigger once or once for each counter? When paying MMMMMM the next turn to grow two more heads, does it go off once or twice?
Please feel free to replace the hypothetical card with an actual card, and also this comment if no hypotheticals remain.