SkulkSkulk is an evasion ability.
A creature with skulk can’t be blocked by creatures with greater power. (See rule 509, “Declare Blockers Step.”)
Multiple instances of skulk on the same creature are redundant. (CR 702.118) (This creature can't be blocked by creatures with greater power.)
At the beginning of your upkeep, you may
discardTo discard a card, move it from its owner’s hand to that player’s graveyard.
By default, effects that cause a player to discard a card allow the affected player to choose which card to discard. Some effects, however, require a random discard or allow another player to choose which card is discarded.
If a card is discarded, but an effect causes it to be put into a hidden zone instead of into its owner’s graveyard without being revealed, all values of that card’s characteristics are considered to be undefined. If a card is discarded this way to pay a cost that specifies a characteristic about the discarded card, that cost payment is illegal; the game returns to the moment before the cost was paid (see rule 733, “Handling Illegal Actions”). (CR 701.9) all the cards in your hand. If you do, draw that many cards.