Eidolon of Obstruction

one generic mana one white mana Enchantment Creature — SpiritPower and toughness2/1

First strike

Loyalty abilities of planeswalkers your opponents control cost one generic mana more to activate.

Death turned admirable conviction into pointless intransigence.

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Eidolon of Obstruction rulings

2020-01-24
Eidolon of Obstruction doesn’t replace the loyalty cost of activating a loyalty ability or cause it to cost more loyalty to activate. It just adds a mana component to the ability’s activation cost.
2020-01-24
Loyalty abilities cost just more to activate, no matter how much loyalty they cost to activate.

Eidolon of Obstruction keyword rules

First strike Rule 702.7

First strike is a static ability that modifies the rules for the combat damage step. (See rule , “Combat Damage Step.”)

If at least one attacking or blocking creature has first strike or double strike (see rule ) as the combat damage step begins, the only creatures that assign combat damage in that step are those with first strike or double strike. After that step, instead of proceeding to the end of combat step, the phase gets a second combat damage step. The only creatures that assign combat damage in that step are the remaining attackers and blockers that had neither first strike nor double strike as the first combat damage step began, as well as the remaining attackers and blockers that currently have double strike. After that step, the phase proceeds to the end of combat step.

Giving first strike to a creature without it after combat damage has already been dealt in the first combat damage step won’t preclude that creature from assigning combat damage in the second combat damage step. Removing first strike from a creature after it has already dealt combat damage in the first combat damage step won’t allow it to also assign combat damage in the second combat damage step (unless the creature has double strike).

Multiple instances of first strike on the same creature are redundant.